Role of amygdala in conditioned and unconditioned fear generated in the periaqueductal gray.

Abstract:

:The amygdala and ventral portion of the periaqueductal gray (vPAG) are crucial for the expression of the contextual freezing behavior. However, it is still unclear whether the amygdala also plays a role in defensive behaviors induced by electrical stimulation of the dorsal periaqueductal gray (dPAG). In the present study, rats were implanted with electrodes into dPAG for determination of the thresholds for freezing and escape responses before and after sham or electrolytic lesions in the amygdala. Animals were then submitted to a context fear conditioning procedure. Amygdala lesions disrupted contextual freezing but did not affect defensive behaviors induced by dPAG electrical stimulation. These results indicate that contextual and unconditioned freezing behaviors are mediated by independent neural circuits.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Oliveira LC,Nobre MJ,Brandão ML,Landeira-Fernandez J

doi

10.1097/00001756-200410050-00028

subject

Has Abstract

pub_date

2004-10-05 00:00:00

pages

2281-5

issue

14

eissn

0959-4965

issn

1473-558X

pii

00001756-200410050-00028

journal_volume

15

pub_type

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