Nature exposure and mental health refers to the association between an individual interacting with natural environments and its effect on the individual's mental health. Most studies consider any interaction with nature as exposure, such as a hike, being in a forest or a place with water (e.g. lake, beach), going on a walk in a park, etc. [1] Currently there is extensive research on the impact of the exposure to nature on people, which finds a beneficial association in various ways. Studies show that the contact of human beings with nature has decreased with the contemporary lifestyle of being most of the time indoors and with increasing time spent on screens. However, the interaction with nature has been considered to be a general health promoter thanks to the many benefits it brings to mental health and cognition as well. [2] As a consequence, therapists use nature in their treatments to improve mental or physical health. These treatments and techniques are called ecotherapy.
Mental health has been defined as the state of mental well-being that enables people to cope with the stresses of life, realize their abilities, learn well and work well, and contribute to their community. [3] Research on the exposure to natural environments show that nature strengthens our mental health in multiple ways, such as lowering stress and improving mood. [4] Moreover, there is evidence that demonstrates that the contact with nature is associated with increases in happiness, subjective well-being, positive affect, positive social interactions and a sense of meaning and purpose in life, as well as decreases in mental distress. [4] A practical example of this are nature walks. These can increase brain activity in the subgenual prefrontal cortex, which becomes deactivated when a person is feeling anxious or depressed. [1]
Research shows that the mental health effects of nature are positive across all ages. [5] In regards to children, in Denmark there was a study done throughout eighteen years that analyzed the comparison between children ages 0–10 years old that lived in neighborhoods with more green space and children from lower levels of exposure to green space. It was found that the children from the higher level of green space had 55% less risk of developing multiple psychiatric disorders, such as depression, schizophrenia, substance disorder, eating disorders, and mood disorders. [6] Similarly, another study done in four European cities found that adults with low levels of exposure to outdoor environments in childhood had significantly worse mental health compared to adults with high levels of exposure to outdoor environments in childhood. [5] In addition, there are restorative effects from nature that support the mental health and well-being for the elderly. Studies show that the interaction of older adults with nature can be linked to better moods, decreased chance of depression, reduced stress levels and improved cognitive function. [7]
Cognition refers to all forms of knowing and awareness, such as perceiving, conceiving, remembering, reasoning, judging, imagining, and problem solving. [8] Thanks to both correlational and experimental research, a positive association has been found between the environment and cognitive abilities. [1] Some of the main benefits that studies have found are improvement on working memory performance, improved attention, cognitive flexibility, and attentional-control tasks. [1] In contrast, exposure to urban environments has been linked to attention deficits. [4]
Short periods of nature exposure can also cause cognitive benefits, including exposure just through images. [9] An attentional-control experiment made by Australian researchers asked college students to participate in a dull, attention-draining task in which they had to press a computer key when they saw certain numbers flash on the screen. Midway through the task participants had micro-breaks of 40 seconds in which they would see either a city scene with a flowering meadow green roof or a bare concrete roof. The participants that viewed the green roof made significantly less omission errors and showed more consistent responding to the task compared to participants who viewed the concrete roof according to the study. [9] Such changes in attention can reflect, for example, on how humans perceive time in nature when compared to urban environments. [10]
In addition to the exposure to images of nature, multiple experimental studies have used a wide range of stimulus types such as sounds and real world exposure. [1] These studies have compared participants’ cognitive performance after nature exposure in comparison with urban environments. [6] A significant impact that has been discovered consistently with natural environments is the improvement in working memory. This has been found persistently through a backward digital span task, in which participants are told to repeat sequences of numbers (which vary in length) in reverse order. Likewise, participants that had exposure to natural environments improved their performance. [1]
Cognitive psychology is the scientific study of mental processes such as attention, language use, memory, perception, problem solving, creativity, and reasoning. Cognitive psychology originated in the 1960s in a break from behaviorism, which held from the 1920s to 1950s that unobservable mental processes were outside the realm of empirical science. This break came as researchers in linguistics and cybernetics, as well as applied psychology, used models of mental processing to explain human behavior. Work derived from cognitive psychology was integrated into other branches of psychology and various other modern disciplines like cognitive science, linguistics, and economics. The domain of cognitive psychology overlaps with that of cognitive science, which takes a more interdisciplinary approach and includes studies of non-human subjects and artificial intelligence.
In psychology, a mood is an affective state. In contrast to emotions or feelings, moods are less specific, less intense and less likely to be provoked or instantiated by a particular stimulus or event. Moods are typically described as having either a positive or negative valence. In other words, people usually talk about being in a good mood or a bad mood. There are many different factors that influence mood, and these can lead to positive or negative effects on mood.
Daydreaming is a stream of consciousness that detaches from current external tasks when one's attention becomes focused on a more personal and internal direction.
Affect, in psychology, is the underlying experience of feeling, emotion, attachment, or mood. It encompasses a wide range of emotional states and can be positive or negative. Affect is a fundamental aspect of human experience and plays a central role in many psychological theories and studies. It can be understood as a combination of three components: emotion, mood, and affectivity. In psychology, the term affect is often used interchangeably with several related terms and concepts, though each term may have slightly different nuances. These terms encompass: emotion, feeling, mood, emotional state, sentiment, affective state, emotional response, affective reactivity, disposition. Researchers and psychologists may employ specific terms based on their focus and the context of their work.
Animal-assisted therapy (AAT) is an alternative or complementary type of therapy that includes the use of animals in a treatment. The goal of this animal-assisted intervention is to improve a patient's social, emotional, or cognitive functioning. Studies have documented some positive effects of the therapy on subjective self-rating scales and on objective physiological measures such as blood pressure and hormone levels.
Brain training is a program of regular activities purported to maintain or improve one's cognitive abilities. The phrase “cognitive ability” usually refers to components of fluid intelligence such as executive function and working memory. Cognitive training reflects a hypothesis that cognitive abilities can be maintained or improved by exercising the brain, analogous to the way physical fitness is improved by exercising the body. Cognitive training activities can take place in numerous modalities such as cardiovascular fitness training, playing online games or completing cognitive tasks in alignment with a training regimen, playing video games that require visuospatial reasoning, and engaging in novel activities such as dance, art, and music.
Hot cognition is a hypothesis on motivated reasoning in which a person's thinking is influenced by their emotional state. Put simply, hot cognition is cognition coloured by emotion. Hot cognition contrasts with cold cognition, which implies cognitive processing of information that is independent of emotional involvement. Hot cognition is proposed to be associated with cognitive and physiological arousal, in which a person is more responsive to environmental factors. As it is automatic, rapid and led by emotion, hot cognition may consequently cause biased decision making. Hot cognition may arise, with varying degrees of strength, in politics, religion, and other sociopolitical contexts because of moral issues, which are inevitably tied to emotion. Hot cognition was initially proposed in 1963 by Robert P. Abelson. The idea became popular in the 1960s and the 1970s.
Childhood trauma is often described as serious adverse childhood experiences (ACEs). Children may go through a range of experiences that classify as psychological trauma; these might include neglect, abandonment, sexual abuse, emotional abuse, and physical abuse. They may also witness abuse of a sibling or parent, or have a mentally ill parent. These events can have profound psychological, physiological, and sociological impacts leading to lasting negative effects on health and well-being. These events may include antisocial behaviors, attention deficit hyperactivity disorder (ADHD), and sleep disturbances. Additionally, children whose mothers have experienced traumatic or stressful events during pregnancy have an increased risk of mental health disorders and other neurodevelopmental disorders.
Reminiscence therapy is used to counsel and support older people, and is an intervention technique with brain-injured patients and those who appear to have "Alzheimer's and other forms of cognitive disease."
Memory and trauma is the deleterious effects that physical or psychological trauma has on memory.
Behavioral activation (BA) is a third-generation behavior therapy for treating mood disorders. Behavioral activation primarily emphasizes engaging in positive and enjoyable activities to enhance one's mood.
Green exercise refers to physical exercise undertaken in natural environments. Physical exercise is well known to provide physical and psychological health benefits. There is also good evidence that viewing, being in, and interacting with natural environments has positive effects, reducing stress and increasing the ability to cope with stress, reducing mental fatigue and improving concentration and cognitive function. The concept of Green exercise has therefore grown out of well-established areas such as the attention restoration theory within environmental psychology which have tended to focus on the psychological and physical effects of viewing nature and well-recognised work about the psychological benefits of physical exercise.
Negative affectivity (NA), or negative affect, is a personality variable that involves the experience of negative emotions and poor self-concept. Negative affectivity subsumes a variety of negative emotions, including anger, contempt, disgust, guilt, fear, and nervousness. Low negative affectivity is characterized by frequent states of calmness and serenity, along with states of confidence, activeness, and great enthusiasm.
Attention restoration theory (ART) asserts that people can concentrate better after spending time in nature, or even looking at scenes of nature. Natural environments abound with "soft fascinations" which a person can reflect upon in "effortless attention", such as clouds moving across the sky, leaves rustling in a breeze or water bubbling over rocks in a stream. Philosophically, nature has long been seen as a source of peace and energy, yet the scientific community started rigorous testing only as recently as the 1990s which has allowed scientific and accurate comments to be made about if nature has a restorative attribute.
Memory improvement is the act of enhancing one's memory. Factors motivating research on improving memory include conditions such as amnesia, age-related memory loss, people’s desire to enhance their memory, and the search to determine factors that impact memory and cognition. There are different techniques to improve memory, some of which include cognitive training, psychopharmacology, diet, stress management, and exercise. Each technique can improve memory in different ways.
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.
Nature connectedness is the extent to which individuals include nature as part of their identity. It includes an understanding of nature and everything it is made up of, even the parts that are not pleasing. Characteristics of nature connectedness are similar to those of a personality trait: nature connectedness is stable over time and across various situations.
A cognitive vulnerability in cognitive psychology is an erroneous belief, cognitive bias, or pattern of thought that predisposes an individual to psychological problems. The vulnerability exists before the symptoms of a psychological disorder appear. After the individual encounters a stressful experience, the cognitive vulnerability shapes a maladaptive response that increases the likelihood of a psychological disorder.
Nature therapy, sometimes referred to as ecotherapy, forest therapy, forest bathing, grounding, earthing, Shinrin-Yoku or Sami Lok, is a practice that describes a broad group of techniques or treatments using nature to improve mental or physical health. Spending time in nature has various physiological benefits such as relaxation and stress reduction. Additionally, it can enhance cardiovascular health and reduce risks of high blood pressure.
Keith Stephen Dobson is a Canadian psychologist, academic, and researcher. With a long career at the University of Calgary in Canada, he now holds the title of Professor Emeritus, having served as a tenured Professor, Head of the Psychology Department, and Director of the Clinical Psychology program at the university.