Time-based prospective memory is a type of prospective memory in which remembrance is triggered by a time-related cue that indicates that a given action needs to be performed. An example is remembering to watch a television program at 3 p.m.In contrast to time-based prospective memory, event-based prospective memory is triggered by an environmental cue that indicates that an action needs to be performed. An example is remembering to send a letter (the action) after seeing a mailbox (the cue). While event-based memory is dependent on the environment, time-based prospective memory is self-initiated; one must specifically monitor the passage of time.
Until recently, not a lot has been known about the cognitive functions of the rostral prefrontal cortex, also known as Area 10 of the brain.In humans, this area of the brain is very large (25-30 cubic cm). The Rostral Prefrontal Cortex supports a cognitive system that reflects either stimulus-oriented (SO) or stimulus-independent (SI) attending. SI attending supports self-generated or self-maintained thought, which is important in prospective memory. This part of the brain has also been shown to play a crucial role in the maintenance and realization of delayed intentions. Delayed intentions triggered by event cues are well understood; time cues however have been less studied.
In a positron emission tomography (PET) study, participants were asked to make a prospective response in either an event-based or time-based task condition.Differences in activation of regions of the rostral prefrontal cortex were seen in the results according to whether the task was time- or event- based. Three rostral prefrontal regions were more active in the time-based condition: the right superior frontal gyrus, anterior medial frontal lobe and anterior cingulate gyrus. These results suggest that there are different processing demands made by event- or time- based prospective memory tasks.
In terms of prospective memory, the parietal lobe plays an important role in processing and recognizing cues that trigger and keep attention focused on intended actions while performing other tasks. This part of the brain is activated most intensely when these cues are visual or spatial.The parietal lobe is located in the superior region of the brain above the occipital lobe and behind the frontal lobe.
For time-based prospective memory, the parietal lobe is important especially when an individual is required to remember numbers, more specifically, a certain time that will act a cue to perform an intended task.The activation of this area is studied using PET as well as magnetoencephalography (MEG). Damage to this area of the brain increases the difficulty of performing time-based tasks more significantly than it does event-based tasks. This is because time-based tasks place more demand on inhibitory control mechanisms than do event-based tasks.
Age is a significant factor that affects prospective memory. Smith et al. (2010) conducted a study comparing time-based prospective memory in children and young adults; they found an increase in preparatory attentional processing for adults –suggesting an improvement of time-based prospective memory from childhood to young adulthood.Consistent with the results of the prior study, Ceci and Bronfenbrenner (1985) found that in a time-based task with 10-year-olds and 14-year-olds, time monitoring was greater among older children.
Another study by Kvavilashvili et al. (2009) comparing time-based prospective memory among young adults (18- to 30-year-olds), young-old adults (60- to 75-year-olds) and old-old adults (79- to 90-year-olds), found that young adults performed the best on time-based tasks.A study further compared the difference between young-old adults and old-old adults in time-based prospective memory, finding that young-old adults outperformed old-old adults. The findings of the above studies suggest that there is ongoing improvement of time-based prospective memory from childhood into young adulthood; however, a decrease begins in later adulthood.
Substance abuse refers to the harmful use of substances, including alcohol and illicit drugs. Multiple studies have shown that abuse of substances can damage our memory system. Current research has looked at the effect of substances on prospective memory; ability to remember to do something in the future. In particular it has been found that cannabis, ecstasy, methamphetamine and alcohol are substances that directly affect time-based prospective memory.
Marijuana is the world's most commonly abused illicit drug. The effects of cannabis are associated with deficits in memory, learning, decision-making, and speed of processing.Montgomery et al. (2012) conducted a study on twenty cannabis-only users and 20 non-illicit drug users to test the effect of cannabis on prospective memory. Cannabis users found it more difficult to perform an action at a certain time than nonusers. The results provide support for the cannabis-related deficits in prospective memory.
Prospective memory impairments in recreational drug users have been documented in recent years.Hadjiefthyvoulou et al. (2011) compared performance of ecstasy users, cannabis users, and nonuser on both event and time-based prospective memory tasks. Ecstasy users performed significantly worse in comparison to both cannabis only and non-user groups on time-based tasks. Time-based prospective memory is sensitive to regular and even moderate use of ecstasy. More importantly, ecstasy users experience generalized difficulties with prospective memory, demonstrating that these deficits are likely to have important implications for daily functioning.
Methamphetamine more commonly known as crystal meth, is a highly addictive drug[ citation needed ]. A fair amount of research indicates that the use of methamphetamine is associated with neurocognitive impairment, more recently there has been a focus on whether these difficulties extend to memory for future intentions. Rendell et al. (2009) found that impairments in time-based prospective memory existed in both current and former users of methamphetamine.
Research has shown that heavy alcohol use clearly leads to deficits in memory. Less is known about the effects of alcohol on day-to-day memory function, specifically, prospective memory, remembering to do things at some future point in time.The results of a study conducted by Heffernan et al. (2010) suggest that binge drinking in the teenage years leads to impairments in everyday prospective memory. A study by Heffernan and O'Neill (2011) further investigated the effect has alcohol on time-based prospective memory and concluded that binge drinking was associated with significantly reduced performance on time-based tasks.
There has been an increase in interest of studying prospective memory deficiencies in individuals with disease or disorder; because daily life largely relies on previously planned intentions a lack thereof would cause major issues for an affected individual. It has been found that many diseases and disorders have negative impacts on prospective memory; the effects extend from mild cognitive impairment to dementia.
A study by Costa et al. (2008) found that individuals with Parkinson's disease were significantly less accurate in time-based tasks than healthy participants; however, there was no difference between the groups in ability to retrieve the intention to perform the actions in the event-based condition.For example, a person with Parkinson's disease might forget to take their prescription at a certain time of the day, but are less likely to forget if they see the medicine bottle. A study by Katai et al. (2003) found results inconsistent with those of Costa and colleagues; individuals with Parkinson's disease were not significantly impaired on time-based tasks, however, these specific results were affected by the fact that 18 out of the 20 participants were receiving levodopa medication –which has been proven to increase performance on time-based tasks.
Research done by Costa et al. (2008)specifically focused on studying the effect of levodopa on the performance of individuals with Parkinson's disease on a time-based prospective memory task. Participants were evaluated in two conditions: after levodopa administration and without drug administration. The researchers found that participants were significantly more accurate in complying with the time-based task following levodopa medication as opposed to the individuals who did not take medication.
Carrying out an action depends on a variety of aspects, including how easily the intended action comes to mind. People may be able to remember what they intend to do, but will only be successful if the information is springs to mind at the appropriate time. People with Alzheimer's disease have great difficulty in remembering to do things, and doing them at the right moment. A study by Spíndola and Brucki (2011), found significant deficits for time-based tasks in patients with Alzheimer's compared with their healthy counterparts.
A failure to perform future intentions can have serious consequences. For example, failing to remember to turn off the burner after a 10-minute cooking time.However, there has been a number of studies, which indicate that individuals with Alzheimer's disease can learn a prospective memory task using spaced-retrieval practice; it is an effective means of helping cognitively impaired older adults maintain functional independence.
Impairment of memory is a major problem for people diagnosed with Schizophrenia. Studies have shown that participants with schizophrenia were significantly impaired on prospective memory tasks; both time-based and event-based.
Medication and a therapeutic technique known as cognitive behavioral therapy are equally important in treating schizophrenia. Prospective memory is important for treating schizophrenia because affected individuals have to remember to take their medication or attend a therapy appointment.Failure to do so can result in the re-emergence of schizophrenic symptoms such as hallucinations, disorganized speech, and paranoia.
Research strongly suggests that emotional processes influence accuracy and the way in which humans carry out intended actions. It has been found that the ability to carry out time-based intended actions is negatively affected when individuals are in depressive emotional states. A study done by Kliegel and Jager (2006)found that performance on time-based tasks suffered when individuals were in a depressive state, as opposed to in an anxious state. The time-based prospective memory task was vulnerable to negative influence of depression, presumably because the time-based task required a high degree of self-initiated, effortful processing; and effortful processing is thought to be diminished in depression.
Further support comes from research done by Jeong and Cranney (2009) who found that depression is negatively associated with time-based prospective memory performance; people in a depressive emotional state were less likely to execute intended actions on time.
Kliegel et al. (2005)investigated the effects of sad mood on time-based prospective memory, and found results consistent with those of the above two studies. However, the study suggests that it would be of interest to extend these results to investigate effects of happy mood fluctuations, because happy mood states impair executive functions more reliably than sad mood.
It is obvious that, to a large extent, people remember what they want to remember. If a person considers a task to be insignificant, they will be less motivated to remember the intention; and ultimately pay less attention to available time-cues. Thus, forgetting of the memory for the intended action is more likely to occur.
In a study by Jeong and Cranney (2009),it was shown that motivation had a rather strong impact on performance in time-based prospective memory tasks. The study involved students who were required to send text messages at a specific time; participants given the incentive of extra course credit (motivation condition) outperformed their counterparts on the time-based task. The results display a positive effect of high motivation on time-based prospective memory.
Another study, done by Kliegel et al. (2008),supports the aforementioned findings. This study explored the effect of motivation in two age groups (three-year-olds and five-year-olds) when completing the same prospective memory task, with different motivational conditions. In the high motivation condition there was no difference for the two age groups, however, in the low-motivation condition, the two age groups differed significantly, with a decline in the performance of three-year-old children.
In order to enhance time-based prospective memory, people should avoid low motivational states.
Prospective memory is performed in the context of another activity.Since memory is limited with the respect to the amount of information it can hold, and the number of operations it can perform, a higher cognitive load would deteriorate performance on prospective memory tasks.
A study by Khan et al. (2008) examined the influence of cognitive load (low vs. high) on time-based prospective memory. The findings implied that time-based prospective memory is severely affected when cognitive load is high. The study attributed the poor performance on time-based tasks as a result of dividing attentional resources into actively monitoring time, self-initiating the response at the appropriate time and the ongoing task.Humans have limited attentional capacity, and therefore high cognitive load affects monitoring of time and consequently time-based prospective memory performance negatively. Numerous aspects of daily life depend on time-based prospective memory, ranging from daily activities such as remembering what time to meet a friend, to more important tasks such as remembering what time to take medication.
Prospective memory as defined by Kvavilashvili et al. (1996) is remembering to do something at a particular moment in the future or the timely execution of a previously formed intention.Time-based prospective memory is when a specific time is the cue indicating that a given action needs to be performed (e.g. calling someone at 3pm). In contrast with time-based prospective memory there is also event-based prospective memory which requires less strain on the cognitive load.
Smith et al. developed The Prospective and Retrospective Memory Questionnaire to make a self-report that covered both retrospective and prospective items, unlike previous self-reports like the Cognitive Failures Questionnaire created by Broadbent et al. (1982) and also the Everyday Memory Questionnaire developed by Sunderland et al. (1988).Consists of 16 items, 8 asking prospective failures and the other 8 asking retrospective failures. The items on the questionnaire are also designed to contain an equal number concerned with either self-cued memory or environmentally cued memory, and with short-term versus long-term memory. The questionnaire provides a useful measure of everyday memory for use in clinical research and practice.
Crawford et al. (2006) constructed a virtual shopping precinct from photographs, sounds and video segments linked together. Their aim was to assess deficits in participants prospective remembering following chronic traumatic brain injuries, under conditions of high and low distractions.Participants are matched with a control group and their goal is complete a list of 10 errands with the help of a checklist. There are 3 targets that appear at certain times throughout their task that make up the prospective component. The group with traumatic brain injuries performed poorly compared to the control group, suggesting how extremely important certain brain areas are in time-based prospective memory.
Participants had to perform a working memory task and were also required to perform a time-based prospective action.Control participants either did one or the other, but not both. In the time-based task participants had to make a key press after intervals of 10 and 20 minutes while they were performing another task. Einstein et al. (1996) found a direct comparison between time-based prospective memory and age/memory type that did not exist when testing event-based prospective memory.
Harris et al. (1982) proposed a time-based prospective memory model stating that people encode the future task and then wait for a period of time until a test of memory seems reasonable.If the time is not correct, people tend to wait until the critical exit period. If performance turns out to be successful, then it is dependent that you check on critical time periods. It is also assumed that this monitoring was an intentional process requiring an individual's full attention.
Research performed by Bakker et al. (2002) examined the relationship between the value of an item borrowed from a patient for a prospective task and the number of cues required by a patient for requesting its return.63 patients (27 men, 36 women) who underwent neuropsychological examinations in Cortical Function Laboratory of the Johns Hopkins Hospital between 1997 and 2000 were analyzed. Most of the patients were elderly and either had known or suspected dementia. The examiner asked the patients for a personal possession, which was then placed into a drawer in full view of the patient. They were then asked to request for their possession to be returned at the end of the testing period which was between 2–3 hours. At the end of the experiment the examiner would say, "O.K. We are done with testing. Let's find Dr. X." If the patient was able to remember to request for their item, she/he earned a score of zero because no additional cues were needed. If the patient was unable to remember to ask for their item back, an additional question asking "I wanted you to remember something at the end of the testing. Do you remember what that was?" If the patient could then remember, he/she was scored a 1 because of 1 additional cue. If the patient was still unable to ask for their item back, an additional question was added again increasing their score to 2. The highest score a patient could receive was 4, and that is when the experiment ended if the patient could not remember what to ask for after 3 additional cues. The relative value of the items taken from patients were determined by 15 Psychology faculty members from Johns Hopkins based on how much distress their owners would feel if the items were lost. A low rank value determines that the item is valuable and a high rank value indicates the item is less valuable. Results show that although sex and education do not affect the ability to remember the item taken, the age of the patient and value of the object are significant.
Everyday functioning often depends on timely execution of intentions at specific times (e.g., paying bills, keeping appointments, making specific phone calls, taking medication).
Time management has developed in order for us to be able to distribute time and get our activities/work complete.Although it is not proven that there is a significant relationship between time-based prospective memory and time management, there is significant correlations that indicate that people who are more organized and manage their time well report better memory.
Technological advancements such as smartphones and products from Apple Inc. allow organization of an individual's day to become a lot more efficient.A study done by Guger et al. explains how a severely memory impaired teenager MK is able to confidently go through her day with schedule and alarm systems provided from smartphones.
Time-based prospective memory is involved in taking oral contraceptive pills daily. A study investigating the satisfaction with oral contraceptive pills and time-based prospective memory by Matter et al. (2008) showed that women who provided higher time-based prospective memory were more satisfied with the pill, as well as receiving less stress levels.
Working memory is a cognitive system with a limited capacity that can hold information temporarily. It is important for reasoning and the guidance of decision-making and behavior. Working memory is often used synonymously with short-term memory, but some theorists consider the two forms of memory distinct, assuming that working memory allows for the manipulation of stored information, whereas short-term memory only refers to the short-term storage of information. Working memory is a theoretical concept central to cognitive psychology, neuropsychology, and neuroscience.
Recall in memory refers to the mental process of retrieval of information from the past. Along with encoding and storage, it is one of the three core processes of memory. There are three main types of recall: free recall, cued recall and serial recall. Psychologists test these forms of recall as a way to study the memory processes of humans and animals. Two main theories of the process of recall are the two-stage theory and the theory of encoding specificity.
Source amnesia is the inability to remember where, when or how previously learned information has been acquired, while retaining the factual knowledge. This branch of amnesia is associated with the malfunctioning of one's explicit memory. It is likely that the disconnect between having the knowledge and remembering the context in which the knowledge was acquired is due to a dissociation between semantic and episodic memory – an individual retains the semantic knowledge, but lacks the episodic knowledge to indicate the context in which the knowledge was gained.
Amotivational syndrome is a chronic psychiatric disorder characterized by signs that are linked to cognitive and emotional states such as detachment, blunted emotion and drives, executive functions like memory and attention, disinterest, passivity, apathy, and a general lack of motivation. This syndrome can be branched into two subtypes - marijuana amotivational syndrome, interchangeably known as cannabis induced amotivational syndrome which is caused by usage and/or dependency of the substance and is primarily associated with long-term effects of cannabis use, and SSRI-induced amotivational syndrome or SSRI-induced apathy caused by the intake of SSRI medication dosage. According to the Handbook of Clinical Psychopharmacology for Therapists, amotivational syndrome is listed as a possible side effect of SSRIs in the treatment of clinical depression.
In cognitive psychology and neuroscience, spatial memory is a form of memory responsible for the recording and recovery of information needed to plan a course to a location and to recall the location of an object or the occurrence of an event. Spatial memory is necessary for orientation in space. Spatial memory can also be divided into egocentric and allocentric spatial memory. A person's spatial memory is required to navigate around a familiar city. A rat's spatial memory is needed to learn the location of food at the end of a maze. In both humans and animals, spatial memories are summarized as a cognitive map.
Prospective memory is a form of memory that involves remembering to perform a planned action or recall a planned intention at some future point in time. Prospective memory tasks are common in daily life and range from the relatively simple to extreme life-or-death situations. Examples of simple tasks include remembering to put the toothpaste cap back on, remembering to reply to an email, or remembering to return a rented movie. Examples of highly important situations include a patient remembering to take medication or a pilot remembering to perform specific safety procedures during a flight.
Age-related memory loss, sometimes described as "normal aging", is qualitatively different from memory loss associated with types of dementia such as Alzheimer's disease, and is believed to have a different brain mechanism.
A source-monitoring error is a type of memory error where the source of a memory is incorrectly attributed to some specific recollected experience. For example, individuals may learn about a current event from a friend, but later report having learned about it on the local news, thus reflecting an incorrect source attribution. This error occurs when normal perceptual and reflective processes are disrupted, either by limited encoding of source information or by disruption to the judgment processes used in source-monitoring. Depression, high stress levels and damage to relevant brain areas are examples of factors that can cause such disruption and hence source-monitoring errors.
Dysexecutive syndrome (DES) consists of a group of symptoms, usually resulting from brain damage, that fall into cognitive, behavioural and emotional categories and tend to occur together. The term was introduced by Alan Baddeley to describe a common pattern of dysfunction in executive functions, such as planning, abstract thinking, flexibility and behavioural control. It is thought to be Baddeley's hypothesized working memory system and the central executive that are the hypothetical systems impaired in DES. The syndrome was once known as frontal lobe syndrome; however 'dysexecutive syndrome' is preferred because it emphasizes the functional pattern of deficits over the location of the syndrome in the frontal lobe, which is often not the only area affected.
The California Verbal Learning Test (CVLT) is one of the most widely used neuropsychological tests in North America. As an instrument, it represents a relatively new approach to clinical psychology and the cognitive science of memory. It measures episodic verbal learning and memory, and demonstrates sensitivity to a range of clinical conditions. The test does this by attempting to link memory deficits with impaired performance on specific tasks. It assesses encoding, recall and recognition in a single modality of item presentation (auditory-verbal). The CVLT is considered to be a more sensitive measure of episodic memory than other verbal learning tests. It was designed to not only measure how much a subject learned, but also reveal strategies employed and the types of errors made. The CVLT indexes free and cued recall, serial position effects, semantic clustering, intrusions, interference and recognition. Delis et al. (1994) released the California Verbal Learning Test for Children (CVLT-C). The California Verbal Learning Test-II (CVLT-II) is an updated version of the original CVLT, which has been standardized and provides normative data.
Retrospective memory is the memory of people, words, and events encountered or experienced in the past. It includes all other types of memory including episodic, semantic and procedural. It can be either implicit or explicit. In contrast, prospective memory involves remembering something or remembering to do something after a delay, such as buying groceries on the way home from work. However, it is very closely linked to retrospective memory, since certain aspects of retrospective memory are required for prospective memory.
In psychology and neuroscience, executive dysfunction, or executive function deficit, is a disruption to the efficacy of the executive functions, which is a group of cognitive processes that regulate, control, and manage other cognitive processes. Executive dysfunction can refer to both neurocognitive deficits and behavioural symptoms. It is implicated in numerous psychopathologies and mental disorders, as well as short-term and long-term changes in non-clinical executive control.
Metamemory or Socratic awareness, a type of metacognition, is both the introspective knowledge of one's own memory capabilities and the processes involved in memory self-monitoring. This self-awareness of memory has important implications for how people learn and use memories. When studying, for example, students make judgments of whether they have successfully learned the assigned material and use these decisions, known as "judgments of learning", to allocate study time.
Ethanol is the type of alcohol found in alcoholic beverages. It is a volatile, flammable, colorless liquid that acts as a central nervous system depressant. Ethanol can impair different types of memory.
Memory improvement is the act of enhancing one's memory. Research on improving memory is driven by amnesia, age-related memory loss, and people’s desire to enhance their memory. Research involved in memory improvement has also worked to determine what factors influence memory and cognition. There are many different techniques to improve memory some of which include cognitive training, psychopharmacology, diet, stress management, and exercise. Each technique can memory in different ways.
Memory gaps and errors refer to the incorrect recall, or complete loss, of information in the memory system for a specific detail and/or event. Memory errors may include remembering events that never occurred, or remembering them differently from the way they actually happened. These errors or gaps can occur due to a number of different reasons, including the emotional involvement in the situation, expectations and environmental changes. As the retention interval between encoding and retrieval of the memory lengthens, there is an increase in both the amount that is forgotten, and the likelihood of a memory error occurring.
Childhood memory refers to memories formed during childhood. Among its other roles, memory functions to guide present behaviour and to predict future outcomes. Memory in childhood is qualitatively and quantitatively different from the memories formed and retrieved in late adolescence and the adult years. Childhood memory research is relatively recent in relation to the study of other types of cognitive processes underpinning behaviour. Understanding the mechanisms by which memories in childhood are encoded and later retrieved has important implications in many areas. Research into childhood memory includes topics such as childhood memory formation and retrieval mechanisms in relation to those in adults, controversies surrounding infantile amnesia and the fact that adults have relatively poor memories of early childhood, the ways in which school environment and family environment influence memory, and the ways in which memory can be improved in childhood to improve overall cognition, performance in school, and well-being, both in childhood and in adulthood.
In psychology, confabulation is a memory error consisting of the production of fabricated, distorted, or misinterpreted memories about oneself or the world. It is generally associated with certain types of brain damage or a specific subset of dementias. While still an area of ongoing research, the basal forebrain is implicated in the phenomenon of confabulation. People who confabulate present with incorrect memories ranging from subtle inaccuracies to surreal fabrications, and may include confusion or distortion in the temporal framing of memories. In general, they are very confident about their recollections, even when challenged with contradictory evidence.
Cerebellar cognitive affective syndrome (CCAS), also called Schmahmann's syndrome is a condition that follows from lesions (damage) to the cerebellum of the brain. It refers to a constellation of deficits in the cognitive domains of executive function, spatial cognition, language, and affect resulting from damage to the cerebellum. Impairments of executive function include problems with planning, set-shifting, abstract reasoning, verbal fluency, and working memory, and there is often perseveration, distractibility and inattention. Language problems include dysprosodia, agrammatism and mild anomia. Deficits in spatial cognition produce visual–spatial disorganization and impaired visual–spatial memory. Personality changes manifest as blunting of affect or disinhibited and inappropriate behavior. These cognitive impairments result in an overall lowering of intellectual function. CCAS challenges the traditional view of the cerebellum being responsible solely for regulation of motor functions. It is now thought that the cerebellum is responsible for monitoring both motor and nonmotor functions. The nonmotor deficits described in CCAS are believed to be caused by dysfunction in cerebellar connections to the cerebral cortex and limbic system.
Visual selective attention is a brain function that controls the processing of retinal input based on whether it is relevant or important. It selects particular representations to enter perceptual awareness and therefore guide behaviour. Through this process, less relevant information is suppressed.