Role of the bed nucleus of the stria terminalis in the acquisition of contextual fear at long or short context-shock intervals

Behavioral Neuroscience
Sayamwong E HammackMark E Bouton

Abstract

Rats received N-methyl-D-aspartate lesions of the bed nucleus of the stria terminalis (BNST) and then 10 aversive conditioning trials in which exposure to a context was paired with footshock. For half the animals, shock was presented 1 min after the onset of each context exposure; for the other half, shock was presented after 10 min. With the 1-min context duration, aversive conditioning (measured by freezing) was unaffected by BNST lesion. In contrast, at the 10-min duration, lesioned animals froze substantially less than sham controls. When 1-min-conditioned animals were left in the context for 10 min, freezing that was evident (though declining) throughout the test was not affected by the BNST lesion. When freezing over 10 min was similarly examined in the 10-min-conditioned animals, BNST lesions caused a deficit that was consistently evident over time. The results indicate that the BNST is involved in aversive conditioning to long-duration, but not merely contextual, conditional stimuli. Results may be less consistent with the view that BNST becomes activated after prolonged fear than the view that it is involved when a cue's onset has a remote temporal relation to shock.

Citations

Jun 29, 2017·Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology·Olivia W MilesSayamwong E Hammack
Mar 30, 2018·Nature Reviews. Neuroscience·Joseph LeDoux, Nathaniel D Daw
Jan 21, 2017·Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology·S Bradley KingSayamwong E Hammack
Apr 27, 2019·Frontiers in Behavioral Neuroscience·Olivia W Miles, Stephen Maren
Aug 18, 2017·Learning & Memory·Travis D Goode, Stephen Maren
Sep 27, 2018·Psychopharmacology·Travis D Goode, Stephen Maren
Nov 20, 2019·Neurobiology of Learning and Memory·Travis D GoodeStephen Maren
Feb 14, 2021·Neurobiology of Learning and Memory·Louise UrienElizabeth P Bauer
May 28, 2019·Neuroscience and Biobehavioral Reviews·E R VelascoR Andero
Apr 19, 2021·Peptides·Melissa N BoucherSayamwong E Hammack

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