Natural predator and a human stimulus differently affect the behavior, cortisol and cerebral hemisphere activity of marmoset monkeys
| Autor: | Renata B. M. Duarte, Rafael S. Maior, Marilia Barros, Lucas C. Pereira |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Male
Tympanic Membrane Hydrocortisone Brain activity and meditation Tympanic membrane temperature Right cerebral hemisphere Physiology Experimental and Cognitive Psychology Stimulus (physiology) Alarm signal Body Temperature 03 medical and health sciences Behavioral Neuroscience Random Allocation 0302 clinical medicine biology.animal Adaptation Psychological Medicine Animals Humans 0501 psychology and cognitive sciences 050102 behavioral science & comparative psychology Predator Cerebrum Sex Characteristics biology Behavior Animal business.industry 05 social sciences Marmoset Callithrix Fear Regional Blood Flow Cerebrovascular Circulation Cerebral hemisphere Female Vocalization Animal business 030217 neurology & neurosurgery Stress Psychological |
| Zdroj: | Physiologybehavior. 195 |
| ISSN: | 1873-507X |
| Popis: | The behavior, cortisol concentration and cerebral hemisphere activity of twelve marmoset monkeys were determined during standardized predatory stress-related events. Each subject was submitted to three 5-min trials, randomly held at 2-week intervals: a human intruder, a taxidermized oncilla cat and a no-stimulus control trial. Stimuli were positioned outside the home-cage and the ensuing reaction recorded. Baseline tympanic membrane temperature (TMT) was subtracted from the post-trial measure to determine changes in blood flow induced by ipsilateral brain activity. Cortisol was assayed immediately after the post-trial TMT assessments. Both genders reacted fearfully/anxiously towards the stimuli – each condition inducing a distinct pattern. Cortisol increased only when females were confronted with the wildcat, with higher levels of alarm calls predicting lower cortisol release. When either stimulus was present, changes in TMT were detected, albeit only in the right ear. The specific directional shift in temperature was gender- and stimulus-dependent, requiring further investigation. The control trial did not alter any of the parameters. Marmosets thus exhibit flexible multileveled coping strategies towards different aversive events, yet in general these seem to be asymmetrically processed by the right cerebral hemisphere. |
| Databáze: | OpenAIRE |
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