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Characterization of the Sense of Agency over the Actions of Neural-machine Interface-operated Prostheses
Published on: January 7, 2019
No dissociation between perception and action in patient DF when haptic feedback is withdrawn
1Department of Neurology, University of Erlangen-Nuremberg, Germany. thomas.schenk@uk-erlangen.de
Summary
Patient DF could grasp objects despite impaired size perception by using haptic feedback. This challenges the perception-action model, highlighting multimodal sensory processing in the dorsal stream.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Visual Perception
Background:
- The perception-action model proposed separate visual processing streams for perception and action.
- Patient DF exhibited visual form agnosia, unable to perceive object size but capable of grasping actions.
Observation:
- DF's grasping ability was re-examined using a mirror apparatus to isolate visual input.
- DF's grasping performance was normal only when haptic feedback was provided after each trial.
Findings:
- Haptic feedback allows DF to compensate for deficits in visual size perception during grasping.
- DF's improved grasping is attributed to multimodal sensory compensation, not purely visual dorsal stream processing.
Implications:
- Challenges the strict separation of perception and action visual streams.
- Emphasizes the crucial role of early interstream interactions and multimodal processing in the dorsal stream.
- Suggests that haptic feedback is vital for action execution in cases of visual agnosia.
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