Lesions of the midline thalamic nuclei impair classical conditioning under partial but not continuous reinforcement conditions.

Abstract:

:Rabbits with lesions of the midline thalamic nuclei were compared to rabbits with sham lesions on classical eyeblink (EB) and heart rate (HR) conditioning. Separate groups of sham and lesioned animals received either 25, 50 or 100% reinforcement with a periorbital shock unconditioned stimulus. Animals with lesions showed slightly impaired EB conditioning, compared to sham animals, under the partial but not continuous reinforcement schedules. Midline lesions also reduced the magnitude of the decelerative HR conditioned response under partial but not continuous reinforcement conditions. These findings suggest that the midline thalamic nuclei, like the mediodorsal nucleus of the thalamus, process information required for response selection under non-optimal learning conditions.

journal_name

Behav Brain Res

authors

Buchanan SL,Powell DA,Beylotte FM 3rd,Penney J

doi

10.1016/s0166-4328(98)00022-9

subject

Has Abstract

pub_date

1998-12-01 00:00:00

pages

49-58

issue

1-2

eissn

0166-4328

issn

1872-7549

pii

S0166-4328(98)00022-9

journal_volume

97

pub_type

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