Social neuroscience is a newly arising scientific discipline devoted to the experimental analysis of bi-directional information flow between social environment of the individual and its nervous system. Research in the domain of social neuroscience is focused both on neurobiological mechanisms underlying social phenomena and processes, and on downward influences of social context on the phenotype of the individual. In the present paper I discuss briefly main methods and techniques used by the scientists working in the field of social neuroscience. They include the use of transgenic animals (in particular, knockout mutants and genetically modified animals obtained by means of transfections with the use of viral factors), non-invasive techniques of the analysis of brain activity (in particular, functional magnetic resonance imaging), lesions of specific brain structures, and a wide spectrum of techniques employed in classical and modern histology and ethopharmacology. I also discuss some recent findings obtained in the research devoted to the mechanisms involved in social recognition, to the role of the reward system of the brain in the mediation of affiliative behaviour and of social bonding, and of the effect of social context on the expression of behaviour, including effects of social stress on the hormonal state, neuronal morphology and neurogenesis, and effects of social context on behavioural development of social insects. The paper also contains a brief summary of main results of several studies carried out in Poland, including those carried out by my team in the Laboratory of Ethology of the Nencki Institute of Experimental Biology in Warsaw. Our current research is focused on two sets of problems, related to two main directions of information flow between various levels of organization encountered in insect societies: neurobiological mechanisms underlying social ties existing in ant colonies, and downward influences of social context on the expression/suppression of specific behaviour patterns.
This paper provides a review of experimental data devoted to some aspects of social organization and reproductive biology of social insects, with a particular stress laid on phenomena encountered among social Hymenoptera. The following questions are discussed in detail: queen polyandry and its consequences, polygyny and polydomy, alternative social systems, supercolonies and unicolonialism, modifications of social organization taking place in the course of social insect invasions, worker reproduction (sexual reproduction and two modes of parthenogenetic reproduction: arrhenotoky and thelytoky), clonal reproduction, and replacement of reproductives arising as a result of colony usurpation by alien homo- and allospecific queens and workers.
The paper discusses selected examples of classical achievements and recent advances in the field of experimental analysis of neurobiological roots of phenomena involved in the formation and maintenance of friendly relationships, attraction, attachment and cooperation among animals and humans. The discussion is focused on experimental data obtained by means of a wide spectrum of modern research methods including the use of transgenic animals, neuroimaging techniques such as positron emission tomography (PET) and functional magnetic resonance imaging (fMRI), and transcranial magnetic stimulation (TMS). A particular stress is laid on neurochemical basis of pair bonding and mother-young bonding, on the role of brain reward system in the phenomena of attachment, romantic love and maternal love and on complex interrelationships between social reward and reward related to drugs of abuse. Brain mechanisms underlying empathy and various forms of altruistic behaviour (including altruistic punishment) are also briefly discussed, with a particular stress laid on the role of brain reward system and cognitive processes in the control of these phenomena.
Summary The paper provides a review of literature data concerning effects of illumination conditions and visual stimulation on behaviour and physiological state of various insects. It is focused on behavioural modifications and permanent structural changes in the visual system and in the central nervous system, induced as a result of exposition to specific illumination conditions during the sensitive phase occurring in the first few days of imaginal life (in the case of holometabolous insects), or during the first few days after eclosion from an egg (in the case of hemimetabolous insects). There are presented also some data on transitory, reversible effects of illumination conditions on behaviour and physiological state of insects, such as habituation and various forms of sensory adaptation.
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