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Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
Published on: May 12, 2019
Behavioral detection of electrical microstimulation in different cortical visual areas
Dona K Murphey1, John H R Maunsell
1Department of Neuroscience, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA.
Current Biology : CB
|April 28, 2007
Summary
Neuronal signals from any visual cortex area can generate perception. This study found similar detection thresholds across early and later visual areas, challenging previous theories.
Area of Science:
- Neuroscience
- Visual Perception
Background:
- Debate exists on whether early or later visual cortex areas are more crucial for perception.
- Previous studies yielded conflicting evidence from neuronal recordings versus imaging and lesion studies.
Purpose of the Study:
- To investigate if neuronal activity in different visual cortex stages (early vs. late) varies in its capacity to support detectable signals.
- To compare behavioral detection thresholds for microstimulation across multiple visual areas.
Main Methods:
- Monkeys were trained on a two-alternative temporal forced-choice task.
- Criterion-free behavioral thresholds were measured for electrical microstimulation in five visual areas: V1, V2, V3A, MT, and inferotemporal cortex.
Main Results:
- Reliable detection thresholds were obtained from all tested sites across visual areas.
- Thresholds showed minimal variation within and between areas, gradually increasing from early to later stages.
- No systematic differences in psychometric function slopes were observed between areas.
Conclusions:
- Neuronal signals of comparable magnitude, regardless of their origin in the visual cortex (early or late stages), can generate percepts.
- These findings suggest a more uniform contribution of neuronal activity across the visual hierarchy to perception than previously assumed.
