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The development of cortical circuits for motion discrimination.
Gordon B Smith1, Audrey Sederberg2, Yishai M Elyada1
1Department of Functional Architecture and Development of Cerebral Cortex, Max Planck Florida Institute for Neuroscience, Jupiter, Florida, USA.
Nature Neuroscience
|January 20, 2015
Summary
Neural immaturities at eye opening, including high neural activity and variability, resolve over three weeks in ferrets, significantly improving visual direction discrimination. This development refines neural population responses for better stimulus processing.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Visual System Research
Background:
- Stimulus discrimination relies on neural response properties like selectivity, variability, and population correlation.
- Previous research primarily characterized neuronal selectivity during visual cortex development.
Purpose of the Study:
- To investigate the developmental changes in neural population responses in the ferret visual cortex after eye opening.
- To understand how these changes impact direction discrimination abilities.
Main Methods:
- In vivo imaging of neural activity in ferret visual cortex at eye opening and over subsequent weeks.
- Analysis of neuronal response properties including sparsity, wave-like activity, variability, and noise correlations.
- Assessment of the impact of stimulus experience on neural noise correlations.
Main Results:
- Newly opened ferret visual cortex shows immature responses: high neuron density, wave-like activity, high variability, and strong noise correlations.
- Over three weeks, responses mature: becoming sparser, losing wave-like activity, and reducing variability and noise correlations.
- Stimulus experience rapidly decreased noise correlations within hours.
Conclusions:
- Developmental changes in neural variability and noise correlations are crucial for improving direction discrimination.
- Experience plays a role in refining neural circuit function for enhanced sensory processing.
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