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Related Experiment Videos

The hippocampus and transverse patterning guided by olfactory cues

J A Dusek1, H Eichenbaum

  • 1Department of Psychology, Boston University, Massachusetts 02215, USA. jdusek@bidmc.harvard.edu

Behavioral Neuroscience
|September 11, 1998
PubMed
Summary
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Rats with hippocampal damage learned olfactory tasks but struggled with continued random performance, indicating the hippocampus is crucial for sustained complex discrimination, not initial learning.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Animal Behavior

Background:

  • The transverse patterning task assesses relational learning and memory.
  • The hippocampus and related structures are vital for complex cognitive functions.
  • Olfactory learning provides a unique modality to study these processes.

Purpose of the Study:

  • To investigate the role of the hippocampal system in olfactory-based transverse patterning.
  • To determine if fornix or perirhinal-entorhinal cortex damage impacts this task.
  • To differentiate between initial acquisition and continued performance.

Main Methods:

  • Rats with hippocampal system damage (fornix or perirhinal-entorhinal lesions) and normal rats were trained on an olfactory transverse patterning task (A+B-, B+C-, C+A-).

Related Experiment Videos

  • Performance was assessed during sequential blocks and randomized trial presentations.
  • Acquisition and continued performance were compared across groups.

    • Main Results:

    • Rats with hippocampal system damage acquired the task as rapidly as normal rats when stimuli were presented in blocks.
    • All groups performed well initially with randomized trials.
    • Normal rats maintained performance with randomization, while lesioned rats showed significant deficits in continued random-order testing.

    Conclusions:

    • The hippocampal system is not essential for the initial acquisition of olfactory transverse patterning.
    • Continued performance on this task, especially under conditions requiring flexible discrimination, critically relies on hippocampal function.
    • Damage to the fornix or perirhinal-entorhinal cortex results in equivalent deficits in continued performance.