Raphe unit activity in freely moving cats: Effects of phasic auditory and visual stimuli
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2017, Medical HypothesesCitation Excerpt :Electrophysiological experiments revealed that there is a positive linear relationship between the activity of serotonergic neurons and the level of tonic motor activity during the sleep-wake cycle [21]. This general pattern is additionally modulated by external stimuli producing a short-lasting excitation of serotonergic neurons [21,22]. Finally, a subpopulation of serotonergic neurons strongly decrease their activity or even become completely silent during the occurrence of an orienting response characterized by an immediate suppression of ongoing gross motor behavior and a turning of the head toward the source of the stimulus so as to foveate it or direct the pinnae toward it [21,23].
Do dorsal raphe 5-HT neurons encode “beneficialness”?
2016, Neurobiology of Learning and MemoryCitation Excerpt :Many DRN neurons in cats gradually change their activity across the arousal-waking sleep cycle and become virtually silent during rapid eye movement sleep (McGinty & Harper, 1976). Behaviorally arousing sensory stimuli may activate DRN cells (Heym, Trulson, & Jacobs, 1982; Trulson & Jacobs, 1979). Later recordings suggest that 5-HT neurons may be associated with rhythmic motor activity or sensorimotor integration (Fornal, Metzler, Marrosu, & Jacobs, 1996; Jacobs & Fornal, 1999; Ranade & Mainen, 2009).
Stress, serotonin, and hippocampal neurogenesis in relation to depression and antidepressant effects
2014, Neuroscience and Biobehavioral ReviewsCitation Excerpt :In anaesthetized rats, prior exposure to 30 min of restraint produces at most a slight non-significant increase in the mean firing activity of DR 5-HT neurons (Bambico et al., 2009b). However, some aversive stimuli, such as a foot shock (Schweimer and Ungless, 2010) or defensive encounter with an intruding conspecific in the home cage or experimenter (Walletschek and Raab, 1982), as well as innocuous (non-noxious) stimuli such as clicks (auditory) and light flashes (visual), are able to increase the firing rate of these neurons in awake cats and tree shrews or anesthetized rats (Heym et al., 1982; Trulson and Jacobs, 1979; Trulson and Preussler, 1984; Walletschek and Raab, 1982). In studies with anesthetized rats investigating the response of DR 5-HT neurons to prior restraint, interspike interval (ISI) histograms showed a clear disruption in the rhythmicity of firing in about half of 5-HT neurons monitored, compared to an otherwise Gaussian profile normally exhibited under non-stress conditions; moreover, the probability of encountering 5-HT neurons that fired in burst was markedly increased by stress exposure (about 50% in comparison to 18% under control, non-stress condition) (Bambico et al., 2009b).
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