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History information emerges in the cortex during learning.

Odeya Marmor1, Yael Pollak1, Chen Doron1

  • 1Department of Medical Neurobiology, Faculty of Medicine, The Institute for Medical Research Israel-Canada (IMRIC), The Hebrew University of Jerusalem, Jerusalem, Israel.

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Summary

Trial history information emerges in the brain during learning. This past experience is encoded in higher-order association cortex (RL) and then travels to the barrel cortex (BC), aiding sensory learning.

Keywords:
barrel cortexhistorylearningmouseneuroscienceposterior parietal cortexrostrolateral cortextexture discriminationwide-field imaging

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Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Cognitive Neuroscience

Background:

  • Learning involves integrating past experiences with current information, but the neural basis for this is unclear.
  • Identifying cortical areas that encode and process historical information during learning is crucial.

Purpose of the Study:

  • To investigate which cortical areas encode trial history information.
  • To understand how this information is modulated during the learning process.
  • To explore the temporal dynamics of history encoding in different cortical regions.

Main Methods:

  • Continuous cortex-wide calcium imaging in mice performing a texture discrimination task.
  • Analysis of neural activity patterns in relation to trial history and learning.
  • Utilizing binary classifiers to decode trial history from neural data.

Main Results:

  • Trial history information was found in the barrel cortex (BC) during stimulus presentation, emerging specifically with learning.
  • Learning-dependent trial history information was also identified in the rostrolateral (RL) association cortex, preceding activity in BC.
  • This history encoding was observed across multiple cortical areas and was independent of motor movements.
  • Single-trial discrimination of trial history was as effective as discriminating current information in both BC and RL.

Conclusions:

  • Past experience is encoded in the cortex during learning, originating in higher-order RL areas.
  • This information is propagated in a top-down manner to lower-order BC for integration with sensory input.
  • The integration of past and present information in BC likely facilitates the learning process.