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Synchronization is the coordination of events to operate a system in unison. For example, the conductor of an orchestra keeps the orchestra synchronized or in time. Systems that operate with all parts in synchrony are said to be synchronous or in sync—and those that are not are asynchronous.
Kin selection is the evolutionary strategy that favours the reproductive success of an organism's relatives, even at a cost to the organism's own survival and reproduction. Kin altruism can look like altruistic behaviour whose evolution is driven by kin selection. Kin selection is an instance of inclusive fitness, which combines the number of offspring produced with the number an individual can ensure the production of by supporting others, such as siblings.
Swarm behaviour, or swarming, is a collective behaviour exhibited by entities, particularly animals, of similar size which aggregate together, perhaps milling about the same spot or perhaps moving en masse or migrating in some direction. It is a highly interdisciplinary topic. As a term, swarming is applied particularly to insects, but can also be applied to any other entity or animal that exhibits swarm behaviour. The term flocking or murmuration can refer specifically to swarm behaviour in birds, herding to refer to swarm behaviour in tetrapods, and shoaling or schooling to refer to swarm behaviour in fish. Phytoplankton also gather in huge swarms called blooms, although these organisms are algae and are not self-propelled the way animals are. By extension, the term "swarm" is applied also to inanimate entities which exhibit parallel behaviours, as in a robot swarm, an earthquake swarm, or a swarm of stars.
Animal communication is the transfer of information from one or a group of animals to one or more other animals that affects the current or future behavior of the receivers. Information may be sent intentionally, as in a courtship display, or unintentionally, as in the transfer of scent from predator to prey. Information may be transferred to an "audience" of several receivers. Animal communication is a rapidly growing area of study in disciplines including animal behavior, sociology, neurology and animal cognition. Many aspects of animal behavior, such as symbolic name use, emotional expression, learning and sexual behavior, are being understood in new ways.
Robin Ian MacDonald Dunbar is a British anthropologist and evolutionary psychologist and a specialist in primate behaviour. He is currently head of the Social and Evolutionary Neuroscience Research Group in the Department of Experimental Psychology at the University of Oxford. He is best known for formulating Dunbar's number, a measurement of the "cognitive limit to the number of individuals with whom any one person can maintain stable relationships".
Social grooming is a behavior in which social animals, including humans, clean or maintain one another's body or appearance. A related term, allogrooming, indicates social grooming between members of the same species. Grooming is a major social activity, and a means by which animals who live in close proximity may bond and reinforce social structures, family links, and build companionships. Social grooming is also used as a means of conflict resolution, maternal behavior and reconciliation in some species. Mutual grooming typically describes the act of grooming between two individuals, often as a part of social grooming, pair bonding, or a precoital activity.
The evolution of human intelligence is closely tied to the evolution of the human brain and to the origin of language. The timeline of human evolution spans approximately seven million years, from the separation of the genus Pan until the emergence of behavioral modernity by 50,000 years ago. The first three million years of this timeline concern Sahelanthropus, the following two million concern Australopithecus and the final two million span the history of the genus Homo in the Paleolithic era.
Dunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an individual knows who each person is and how each person relates to every other person. This number was first proposed in the 1990s by British anthropologist Robin Dunbar, who found a correlation between primate brain size and average social group size. By using the average human brain size and extrapolating from the results of primates, he proposed that humans can comfortably maintain 150 stable relationships. There is some evidence that brain structure predicts the number of friends one has, though causality remains to be seen. Dunbar explained it informally as "the number of people you would not feel embarrassed about joining uninvited for a drink if you happened to bump into them in a bar." Dunbar theorised that "this limit is a direct function of relative neocortex size, and that this, in turn, limits group size [...] the limit imposed by neocortical processing capacity is simply on the number of individuals with whom a stable inter-personal relationship can be maintained". On the periphery, the number also includes past colleagues, such as high school friends, with whom a person would want to reacquaint themselves if they met again. Proponents assert that numbers larger than this generally require more restrictive rules, laws, and enforced norms to maintain a stable, cohesive group. It has been proposed to lie between 100 and 250, with a commonly used value of 150.
Cooperative breeding is a social system characterized by alloparental care: offspring receive care not only from their parents, but also from additional group members, often called helpers. Cooperative breeding encompasses a wide variety of group structures, from a breeding pair with helpers that are offspring from a previous season, to groups with multiple breeding males and females (polygynandry) and helpers that are the adult offspring of some but not all of the breeders in the group, to groups in which helpers sometimes achieve co-breeding status by producing their own offspring as part of the group's brood. Cooperative breeding occurs across taxonomic groups including birds, mammals, fish, and insects.
The evolutionary origin of religions and religious behavior is a field of study related to evolutionary psychology, the origin of language and mythology, and cross-cultural comparison of the anthropology of religion. Some subjects of interest include Neolithic religion, evidence for spirituality or cultic behavior in the Upper Paleolithic, and similarities in great ape behavior.
Anne C. Campbell was a British academic and author specializing in evolutionary psychology. Her research was largely concerned with sex differences in aggression between men and women. She was professor of psychology at Durham University.
A biological network is a method of representing systems as complex sets of binary interactions or relations between various biological entities. In general, networks or graphs are used to capture relationships between entities or objects. A typical graphing representation consists of a set of nodes connected by edges.
In animal behaviour, the hypothesis of group augmentation is where animals living in a group behave so as to increase the group's size, namely through the recruitment of new members. Such behaviour could be selected for if larger group size increases the chance of survival of the individuals in the group. Supported hypothesis of selection mechanisms towards increasing group size currently exist, in helping raise other animals' offspring and performing other cooperative breeding acts including kin selection. It is currently proposed that group augmentation may be another mechanism which occurs through the recruiting of new group members and helping of unrelated individuals within a group.
Sexual swellings are enlarged areas of genital and perineal skin occurring in some female primates that vary in size over the course of the menstrual cycle. Thought to be an honest signal of fertility, male primates are attracted to these swellings; preferring, and competing for, females with the largest swellings.
Imitative learning is a type of social learning whereby new behaviors are acquired via imitation. Imitation aids in communication, social interaction, and the ability to modulate one's emotions to account for the emotions of others, and is "essential for healthy sensorimotor development and social functioning". The ability to match one's actions to those observed in others occurs in humans and animals; imitative learning plays an important role in humans in cultural development. Imitative learning is different from observational learning in that it requires a duplication of the behaviour exhibited by the model, whereas observational learning can occur when the learner observes an unwanted behaviour and its subsequent consequences and as a result learns to avoid that behaviour.
Infanticide in non-human primates occurs when an individual kills its own or another individual's dependent young. Five hypotheses have been proposed to explain infanticide in non-human primates: exploitation, resource competition, parental manipulation, sexual selection, and social pathology.
Evolution of cognition is the idea that life on earth has gone from organisms with little to no cognitive function to a greatly varying display of cognitive function that we see in organisms today. Animal cognition is largely studied by observing behavior, which makes studying extinct species difficult. The definition of cognition varies by discipline; psychologists tend define cognition by human behaviors, while ethologists have widely varying definitions. Ethological definitions of cognition range from only considering cognition in animals to be behaviors exhibited in humans, while others consider anything action involving a nervous system to be cognitive.
Pathogen avoidance, also referred to as, parasite avoidance or pathogen disgust, refers to the theory that the disgust response, in humans, is an adaptive system that guides behavior to avoid infection caused by parasites such as viruses, bacteria, fungi, protozoa, helminth worms, arthropods and social parasites. Pathogen avoidance is a psychological mechanism associated with the behavioral immune system. Pathogen avoidance has been discussed as one of the three domains of disgust which also include sexual and moral disgust.
Consoling touch is a pro-social behavior involving physical contact between a distressed individual and a caregiver. The physical contact, most commonly recognized in the form of a hand hold or embrace, is intended to comfort one or more of the participating individuals. Consoling touch is intended to alleviate or lessen emotional or physical pain. This type of social support has been observed across species and cultures. Studies have found little difference in the applications of consoling touch, with minor differences in frequency occurrence across cultures. These findings suggest a degree of universality. It remains unclear whether the relationship between social touch and interpersonal emotional bonds reflect biologically driven or culturally normative behavior. Evidence of consoling touch in non-human primates, who embrace one another following distressing events, suggest a biological basis. Numerous studies of consoling touch in humans and animals unveil a consistent physiological response. An embrace from a friend, relative, or even stranger can trigger the release of oxytocin, dopamine, and serotonin into the bloodstream. These neurotransmitters are associated with positive mood, numerous health benefits, and longevity. Cortisol, a stress hormone, also decreases. Studies have found that the degree of intimacy and quality of relationship between consoler and the consoled mediates physiological effects. In other words, while subjects experience reduced cortisol levels while holding the hand of a stranger, they exhibit a larger effect when receiving comfort from a trusted friend, and greater still, when holding the hand of a high quality romantic partner.
Neural synchrony is the correlation of brain activity across two or more people over time. In social and affective neuroscience, neural synchrony specifically refers to the degree of similarity between the spatio-temporal neural fluctuations of multiple people. This phenomenon represents the convergence and coupling of different people's neurocognitive systems, and it is thought to be the neural substrate for many forms of interpersonal dynamics and shared experiences. Some research also refers to neural synchrony as inter-brain synchrony, brain-to-brain coupling, inter-subject correlation, between-brain connectivity, or neural coupling. In the current literature, neural synchrony is notably distinct from intra-brain synchrony—sometimes also called neural synchrony—which denotes the coupling of activity across regions of a single individual's brain.
References
- ↑ King, Andrew J.; Cowlishaw, Guy (2009-12-01). "All together now: behavioural synchrony in baboons". Animal Behaviour. 78 (6): 1381–1387. CiteSeerX 10.1.1.544.1125 . doi:10.1016/j.anbehav.2009.09.009. S2CID 53151471.
- ↑ Copeland, Jonathan; Moiseff, Andrew (1994). "The occurrence of synchrony in the North American fireflyPhotinus carolinus (Coleoptera: Lampyridae)". Journal of Insect Behavior. 8 (3): 381–394. doi:10.1007/BF01989366. ISSN 0892-7553. S2CID 25639506.
- 1 2 Cohen, Emma E. A.; Ejsmond-Frey, Robin; Knight, Nicola; Dunbar, R. I. M. (2010-02-23). "Rowers' high: behavioural synchrony is correlated with elevated pain thresholds". Biology Letters. 6 (1): 106–108. doi:10.1098/rsbl.2009.0670. ISSN 1744-9561. PMC 2817271 . PMID 19755532.
- ↑ Baimel, Adam; Severson, Rachel L.; Baron, Andrew S.; Birch, Susan A. J. (2015-06-23). "Enhancing "theory of mind" through behavioral synchrony". Frontiers in Psychology. 6: 870. doi: 10.3389/fpsyg.2015.00870 . ISSN 1664-1078. PMC 4477228 . PMID 26157415.
- ↑ Ermentrout, B. (1991). "An adaptive model for synchrony in the firefly Pteroptyx malaccae". Journal of Mathematical Biology. 29 (6): 571–585. doi:10.1007/BF00164052. ISSN 0303-6812. S2CID 4939532.
- ↑ Sumpter, D. J. T. (2006-01-29). "The principles of collective animal behaviour". Philosophical Transactions of the Royal Society B: Biological Sciences. 361 (1465): 5–22. doi:10.1098/rstb.2005.1733. ISSN 0962-8436. PMC 1626537 . PMID 16553306.
- 1 2 Dávid-Barrett, Tamás; Dunbar, R. I. M. (2012-09-07). "Cooperation, behavioural synchrony and status in social networks". Journal of Theoretical Biology. 308: 88–95. doi:10.1016/j.jtbi.2012.05.007. PMID 22609470.
- 1 2 Dávid-Barrett, T.; Dunbar, R. I. M. (2013-08-22). "Processing power limits social group size: computational evidence for the cognitive costs of sociality". Proc. R. Soc. B. 280 (1765): 20131151. doi:10.1098/rspb.2013.1151. ISSN 0962-8452. PMC 3712454 . PMID 23804623.
- 1 2 Dávid-Barrett, Tamás; Dunbar, R. I. M. (2013-10-22). "Social elites can emerge naturally when interaction in networks is restricted". Behavioral Ecology. 25 (1): 58–68. doi: 10.1093/beheco/art085 . ISSN 1045-2249.
- ↑ Dávid-Barrett, Tamás; Carney, James (2016-10-01). "The deification of historical figures and the emergence of priesthoods as a solution to a network coordination problem". Religion, Brain & Behavior. 6 (4): 307–317. doi:10.1080/2153599X.2015.1063001. ISSN 2153-599X. S2CID 146979343.