Threat imminence dictates the role of the bed nucleus of the stria terminalis in contextual fear
| Autor: | Gillian M. Acca, Stephen Maren, Travis D. Goode |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Male
Cognitive Neuroscience Conditioning Classical Experimental and Cognitive Psychology Context (language use) Contextual fear Unconditioned stimulus 050105 experimental psychology Article 03 medical and health sciences Behavioral Neuroscience 0302 clinical medicine Male rats medicine Avoidance Learning Animals 0501 psychology and cognitive sciences Rats Long-Evans Fear conditioning Electroshock Behavior Animal 05 social sciences Fear 030227 psychiatry Stria terminalis medicine.anatomical_structure Anxiety Conditioning Septal Nuclei medicine.symptom Psychology Neuroscience Nucleus 030217 neurology & neurosurgery |
| Zdroj: | Neurobiol Learn Mem |
| ISSN: | 1095-9564 |
| Popis: | Recent work indicates that the bed nucleus of the stria terminalis (BNST) is critically involved in the regulation of conditioned fear responses to unpredictable threats. Here we examined whether the involvement of the BNST in contextual fear conditioning in male rats depends on the imminence of shock after placement in the conditioning chamber. Specifically, we hypothesized that the BNST supports contextual freezing after conditioning with delayed, but not imminent, footshock (relative to placement in the context). Rats were implanted with cannulae targeting the BNST and underwent a contextual fear conditioning procedure in which a single footshock unconditioned stimulus (US) was delivered either 1 min or 9 min after the rat was placed in the context; the rats received a total of four identical conditioning sessions over two days, all with equivalent exposure to the context. Contexts associated with either imminent or delayed US onsets produced distinct patterns of freezing and shock-induced activity but freezing in each case was context-dependent. Reversible inactivation of the BNST reduced the expression of contextual freezing in the context paired with delayed (9 min), but not imminent (1 min), footshock onset. Implications of these data are discussed in the light of recent conceptualizations of BNST function, as well as for anxiety behaviors. |
| Databáze: | OpenAIRE |
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