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Context dependence of receptive field remapping in superior colliculus
Jan Churan1, Daniel Guitton, Christopher C Pack
1Montreal Neurological Institute, McGill University, Montreal, Canada. jan.churan@gmail.com
Journal of Neurophysiology
|July 15, 2011
Summary
Brain mechanisms maintain stable perception during movement. Visual context, like background light, significantly impacts neural remapping, suggesting a preference for visual cues over internal signals when available.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Vision Science
Background:
- Perceptual stability is maintained despite eye, head, and body movements.
- Mechanisms include spatial relationships among objects or internal motor command copies.
- Visual receptive field remapping around saccades provides evidence for motor-based mechanisms.
Purpose of the Study:
- Investigate the interaction between visual stimulation and neural remapping.
- Understand how sensory context influences perceptual stability mechanisms.
- Determine the role of extraretinal versus visual signals in different contexts.
Main Methods:
- Recorded single neuron activity in the superior colliculus of macaque monkeys.
- Utilized various visual stimulus conditions, including different background luminances.
- Examined neural responses during saccadic eye movements and visual stimulation.
Main Results:
- Neural remapping responses are highly sensitive to low-level visual signals.
- Overall background luminance significantly influences remapping.
- Remapping was common in darkness but decreased or abolished with modest background illumination.
Conclusions:
- The brain prioritizes visual landmarks over extraretinal signals when visual cues are available.
- Visual context plays a crucial role in modulating neural mechanisms for perceptual stability.
- Understanding these interactions is key to a comprehensive theory of stable perception.
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