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A neuronal correlate for time interval estimation in the crow's telencephalon.

Melissa Johnston1, Maximilian E Kirschhock1, Andreas Nieder2

  • 1Animal Physiology Unit, Institute of Neurobiology, University of Tübingen, Tübingen, Germany.

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Carrion crows can estimate time intervals, a key behavior for many animals. Their nidopallium caudolaterale (NCL) brain region encodes time abstractly, similar to mammals but with different neural structures.

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Cognitive Science

Background:

  • Interval timing is crucial for animal behaviors, but its neural basis in birds is not well understood.
  • In mammals, interval timing involves specific cortical and sub-cortical brain regions.

Purpose of the Study:

  • To investigate the neural mechanisms of interval timing in birds.
  • To determine if the avian brain, specifically the nidopallium caudolaterale (NCL), supports abstract time estimation.

Main Methods:

  • Two carrion crows were trained on a visual time estimation task with durations of 1500 ms, 3000 ms, and 6000 ms.
  • Single-neuron activity was recorded from the NCL during the task.
  • Population-level decoding was used to analyze neural activity patterns.

Main Results:

  • Many NCL neurons exhibited tuning to specific durations, indicating encoding of time as abstract magnitudes.
  • NCL neural activity predicted the crows' intended wait time, irrespective of sensory cue properties.
  • Evidence suggests abstract time estimation can arise from neural architectures distinct from the mammalian neocortex.

Conclusions:

  • The avian NCL plays a significant role in abstract time estimation.
  • Birds' brains can process and represent time intervals in a manner comparable to mammals, despite differing neural structures.
  • This study advances our understanding of the evolution of cognitive functions like interval timing.