Abstract:
:Lateralization of the Morris water maze task was examined by injecting 5 ng of tetrodotoxin (TTX) into one dorsal hippocampus (HPC) of chronically cannulated rats (n = 20). The task, acquired (A) during unilateral HPC block, was retrieved (R) during TTX blockade of the ipsi- (I) or contralateral (C) HPC. Escape latencies (in seconds) at 3 levels of acquisition and in the first 4-trial block of I or C retrieval suggest lateralization was absent after the first block (A = 49, I = 40, C = 44), partial after training to an efficient search strategy (A = 6, I = 9, C = 14), and complete after overtraining to goal-directed escape (A = 4, I = 4, C = 12), as further indicated by comparisons of A vs. R behavior and probe trials. The analyses also indicate that (a) HPC contributes to the acquisition but is unnecessary for retrieval of the procedural engram, (b) overtrained learning with one HPC or intact brain is similar, and (c) there is no left-right hemispheric specialization for place learning.
journal_name
Behav Neuroscijournal_title
Behavioral neuroscienceauthors
Fenton AA,Bures Jdoi
10.1037//0735-7044.107.4.552subject
Has Abstractpub_date
1993-08-01 00:00:00pages
552-64issue
4eissn
0735-7044issn
1939-0084journal_volume
107pub_type
杂志文章abstract::The present series of three experiments was concerned with the effects of morphine and the morphine antagonist naloxone on the development of a classical aversive heart rate (HR) conditioned response (CR) to a tone conditioned stimulus (CS) paired with an electric shock unconditioned stimulus (US). In the first study,...
journal_title:Behavioral neuroscience
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