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Periodic stimulation induces long-range modulation of cortical responses and visual perception
Chun-feng Shang1, Yang Dan, Mu-ming Poo
1Institute of Neuroscience, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China 200031.
The Journal of Physiology
|May 5, 2011
Summary
Periodic sensory stimuli significantly influence neural circuits and perception over longer distances compared to aperiodic stimuli. This research highlights the global impact of regular environmental cues on brain processing and visual experience.
Area of Science:
- Neuroscience
- Visual Perception
- Sensory Processing
Background:
- Periodic sensory stimuli are common in nature and may indicate important events.
- The differential processing of periodic versus aperiodic stimuli by neural circuits is not well understood.
Purpose of the Study:
- To investigate whether periodic and aperiodic stimuli are processed differently by neural circuits.
- To compare the spatial extent of influence for periodic and aperiodic stimuli at neuronal and perceptual levels.
Main Methods:
- Whole-cell recordings from rat visual cortex to measure neuronal responses to visual stimulation.
- Human psychophysical experiments to assess the perceptual impact of surround luminance changes on a central test stimulus.
Main Results:
- Periodic visual stimulation outside the receptive field induced robust membrane potential oscillations in rat visual cortex, unlike aperiodic stimulation.
- Periodic luminance changes in the visual surround had a stronger modulatory effect on perceived brightness than aperiodic changes.
- Both neuronal and perceptual modulation by periodic stimuli increased with the number of stimulation cycles.
Conclusions:
- Periodic stimuli exert influences over greater distances than aperiodic stimuli at both neuronal and perceptual levels.
- Regular sensory input has a more global impact on cortical information processing and visual perception than irregular input.
