Related Experiment Videos
Neural correlates of structure-from-motion perception in macaque V1 and MT
Alexander Grunewald1, David C Bradley, Richard A Andersen
1Division of Biology, California Institute of Technology, Pasadena, California 91125, USA.
Summary
Neural activity in areas V1 and MT relates to structure-from-motion (SFM) perception. Area MT is directly involved in generating SFM percepts, while V1 may receive top-down feedback.
Area of Science:
- Neuroscience
- Computational Vision
Background:
- Structure-from-motion (SFM) enables 3D shape perception from visual motion cues.
- Understanding the neural basis of SFM perception involves examining activity in visual cortical areas.
Purpose of the Study:
- Investigate the relationship between neural activity in cortical areas V1 and MT and the perception of SFM.
- Determine the role of V1 and MT in the generation of SFM percepts.
Main Methods:
- Utilized a bistable SFM stimulus allowing for dual perceptions.
- Monkeys performed a depth-order task indicating motion direction.
- Excluded data contaminated by eye position effects.
Main Results:
- Stimulus affected approximately 50% of V1 neurons and 80% of MT neurons.
- Perceptual modulation observed in 20% of V1 neurons and over 60% of MT neurons.
- Perceptual modulation in MT correlated with neural tuning; not in V1.
Conclusions:
- Area MT appears directly involved in generating SFM percepts.
- Area V1 is likely not directly involved, possibly influenced by top-down feedback from MT.
- Neural activity in MT is more strongly modulated by SFM perception than in V1.