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Spatial reversal learning deficit after medial cortex lesion in turtles.

J C López1, Y Gómez, J P Vargas

  • 1Laboratorio de Psicobiología, Universidad de Sevilla, Campus Santiago Ramón y Cajal, c/Camilo José Cela, s/n, Spain. jclopez@us.es

Neuroscience Letters
|April 17, 2003
PubMed
Summary

Reptilian medial cortex is homologous to the mammalian hippocampus. Lesioning this area in turtles impaired spatial reversal learning, suggesting its crucial role in complex place learning.

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Area of Science:

  • Neuroscience
  • Comparative Psychology
  • Ethology

Background:

  • The medial cortex of the reptilian forebrain is hypothesized to be homologous to the hippocampal formation.
  • Evidence suggests this structure is involved in complex spatial learning, similar to mammalian and avian hippocampi.

Purpose of the Study:

  • To investigate the effects of medial cortex lesions on reversal learning in turtles.
  • To compare spatial and non-spatial reversal learning performance after medial cortex damage.

Main Methods:

  • Turtles underwent training in spatial and non-spatial maze procedures, including reversal phases.
  • Performance was assessed in sham-lesioned control groups and groups with medial cortex lesions.

Main Results:

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  • All turtles performed well during initial learning (acquisition) in both spatial and non-spatial tasks.
  • Turtles with medial cortex lesions exhibited impaired performance specifically during the spatial reversal phase.

Conclusions:

  • Turtles possess distinct spatial learning and memory systems, paralleling those in other vertebrates.
  • The medial cortex plays a critical role in complex place learning and spatial memory in turtles.