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Published on: August 25, 2020
Memory for proprioceptive and multisensory targets is partially coded relative to gaze
Stephanie A H Jones1, Denise Y P Henriques
1Centre for Vision Research, York University, Toronto, Ontario, Canada.
Reach endpoint errors depend on gaze direction for proprioceptive and multisensory targets. The brain represents target locations relative to gaze, but visual and proprioceptive information are not optimally integrated for multisensory targets.
Area of Science:
- Neuroscience
- Motor Control
- Human Movement Science
Background:
- Gaze direction influences motor control, particularly reach accuracy.
- Previous research indicates gaze-relative coding for visually remembered and online proprioceptive targets.
- The integration of visual and proprioceptive information in reach guidance remains an active area of investigation.
Purpose of the Study:
- To investigate the effect of gaze direction on reach endpoint errors for proprioceptive and multisensory targets.
- To explore the integration of visual and proprioceptive information in guiding reaches.
- To determine if target location is represented relative to gaze across different target modalities and memory conditions.
Main Methods:
- Participants performed reaches to unseen targets (left hand) in darkness with varying gaze directions.
- Targets included online and remembered proprioceptive stimuli, and multisensory (briefly visible proprioceptive) stimuli.
- Reach endpoint errors were analyzed in relation to gaze direction and target modality.
Main Results:
- Horizontal reach errors systematically varied with gaze direction for all tested target modalities.
- This gaze-relative coding was observed for the first time in remembered proprioceptive targets and briefly visible proprioceptive targets.
- Optimal integration of visual and proprioceptive information was not observed for multisensory targets in this paradigm.
Conclusions:
- The brain appears to represent online and remembered proprioceptive target locations, as well as visual-proprioceptive target locations, relative to gaze.
- These findings extend the concept of gaze-relative motor representations to include remembered proprioceptive information.
- The study highlights complexities in multisensory integration for reach guidance, suggesting non-optimal integration in the tested paradigm.
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