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A role for acetylcholine in spatial memory in turtles

M Petrillo1, C A Ritter, A S Powers

  • 1Department of Psychology, St. John's University, Jamaica, NY 11439.

Physiology & Behavior
|July 1, 1994
PubMed
Summary
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Acetylcholine plays a key role in turtle maze memory. Disrupting the basal forebrain or dorsal cortex, or using scopolamine, impaired memory performance, suggesting cholinergic involvement in associative learning.

Area of Science:

  • Neuroscience
  • Animal Behavior

Background:

  • Cholinergic cells in the turtle basal forebrain project to the dorsal cortex.
  • The dorsal cortex is associated with associative functions.

Purpose of the Study:

  • To investigate the role of acetylcholine in turtle maze memory.
  • To determine if basal forebrain or dorsal cortex lesions affect maze learning.
  • To assess the impact of cholinergic drugs on memory retention.

Main Methods:

  • Turtles were trained on an X-maze for water reward.
  • Lesions were made to the dorsal cortex or basal forebrain; performance was retested.
  • Turtles received saline, scopolamine, or methylscopolamine during a retention test.

Main Results:

Related Experiment Videos

  • Lesions of the dorsal cortex and basal forebrain significantly impaired maze performance.
  • Higher doses of scopolamine, a muscarinic antagonist, impaired maze performance.
  • Methylscopolamine, another muscarinic antagonist, did not affect performance.
  • Scopolamine's effects were specific to the learned task, not general activity.

Conclusions:

  • Acetylcholine is involved in maze memory in turtles.
  • The basal forebrain and dorsal cortex are crucial for associative learning in turtles.
  • Cholinergic systems, particularly muscarinic receptors, mediate spatial memory in reptiles.