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An increase in spontaneous activity mediates visual habituation.

Jae-Eun Kang Miller1, Bradley R Miller2, Darik A O'Neil3

  • 1NeuroTechnology Center, Department of Biological Sciences, Columbia University, New York, NY 10027, USA; Department of Psychiatry, Columbia University, New York, NY 10032, USA; Division of Systems Neuroscience, New York State Psychiatric Institute, New York, NY 10032, USA.

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Summary

Spontaneous brain activity in the cerebral cortex increases during habituation to visual stimuli. This heightened activity accelerates learning and may help filter sensory information based on experience.

Keywords:
CP: NeuroscienceV1intrinsic activitymouseongoing activityperceptual learningvisual memoryvisual recognition

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Area of Science:

  • Neuroscience
  • Systems Neuroscience
  • Computational Neuroscience

Background:

  • The function of the brain's constant spontaneous activity is not well understood.
  • Investigating the role of spontaneous activity in learning and sensory processing is crucial.

Purpose of the Study:

  • To determine if spontaneous neural activity in the mouse primary visual cortex encodes learned experiences, specifically during visual habituation.
  • To explore the relationship between spontaneous activity levels and the degree of habituation.

Main Methods:

  • Chronic two-photon calcium imaging was used to measure neuronal population responses in the primary visual cortex of mice.
  • Visual habituation to a specific oriented stimulus was employed as the learning paradigm.
  • Two-photon optogenetic stimulation was used to manipulate spontaneous activity levels.

Main Results:

  • Spontaneous activity increased across all orientation-selective neurons during habituation, reaching levels comparable to stimulus-evoked activity.
  • The increase in spontaneous activity showed a strong correlation with the extent of habituation.
  • Artificially boosting spontaneous activity accelerated the habituation process.

Conclusions:

  • Cortical spontaneous activity is functionally linked to the process of habituation.
  • Habituation may occur by reducing the discrepancy between spontaneous and stimulus-evoked neural activity.
  • Baseline spontaneous activity could play a role in gating sensory information based on prior learning.