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Piriform cortex ablations block navigational map learning in homing pigeons

A Gagliardo1, M Mazzotto, V P Bingman

  • 1Dipartimento di Scienze del Comportamento Animale e dell'Uomo, Pisa, Italy. annag@discau.unipi.it

Behavioural Brain Research
|July 1, 1997
PubMed
Summary
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Piriform cortex ablations in young homing pigeons disrupt navigational learning. This brain region is essential for developing navigational maps using olfactory cues, with no substitution possible.

Area of Science:

  • Neuroscience
  • Animal Behavior
  • Sensory Systems

Background:

  • Homing pigeons possess remarkable navigational abilities.
  • The piriform cortex is a key olfactory processing center in the brain.

Purpose of the Study:

  • To investigate the necessity of the piriform cortex for navigational map learning in young homing pigeons.
  • To determine if other brain regions or non-olfactory cues can compensate for piriform cortex function in navigation.

Main Methods:

  • Young homing pigeons underwent piriform cortex ablations or were left intact (controls).
  • Pigeons learned a navigational map over three months.
  • Navigation was tested by releasing pigeons from unfamiliar locations.

Main Results:

Related Experiment Videos

  • Control pigeons successfully oriented homeward, demonstrating effective navigational map learning.
  • Pigeons with piriform cortex ablations showed impaired homing, consistently orienting east.
  • Lesioned pigeons took longer to return and were more prone to getting lost.

Conclusions:

  • Piriform cortex is essential for navigational map learning in homing pigeons.
  • The olfactory processing role of the piriform cortex in navigation cannot be substituted by other brain regions.
  • Olfactory cues are critical for navigational map formation and cannot be replaced by non-olfactory stimuli.