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Unihemispheric evidence accumulation in pigeons.

Neslihan Wittek1, Hiroshi Matsui1, Mehdi Behroozi1

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Pigeons exhibit perceptual decision-making dynamics similar to mammals, revealing a shared cognitive process in vertebrates. This study highlights independent hemispheric processing in birds, influencing their rapid motor responses.

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Area of Science:

  • Cognitive neuroscience
  • Comparative psychology
  • Neurobiology

Background:

  • Perceptual decision-making relies on accumulating sensory evidence to trigger actions.
  • Mammalian studies show stochastic evidence accumulation to a threshold.
  • Birds, evolving independently, offer a unique model for comparative cognition.

Purpose of the Study:

  • To investigate if pigeons display comparable behavioral and computational dynamics in perceptual decision-making as mammals.
  • To explore the evolutionary conservation of decision-making processes across vertebrate classes.

Main Methods:

  • Utilized a novel "pigeon helmet" with liquid shutter displays for precise, uni-eye visual input control.
  • Monitored behavioral responses and computational dynamics during visual decision tasks.

Main Results:

  • Pigeons demonstrated perceptual decision-making dynamics highly similar to primates and rodents.
  • Evidence suggests independent sensory accumulation processes in each avian hemisphere.
  • Lack of significant interhemispheric exchange was observed, possibly due to avian brain structure.

Conclusions:

  • Perceptual decision-making via evidence accumulation appears to be a fundamental, conserved cognitive process across mammals and birds.
  • Avian unihemispheric processing may necessitate rapid, independent decisions under time constraints.
  • This finding deepens our understanding of the evolution of decision-making strategies in vertebrates.