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A color-contingent prism displacement aftereffect.
Perception
|January 1, 1985
Summary
Pointing training with visual feedback can alter perceived object location. This visual alignment aftereffect depends on pointing with the same arm and requires sensory feedback for prism adaptation.
Area of Science:
- Neuroscience
- Perception Psychology
- Sensorimotor Control
Background:
- The brain integrates visual and proprioceptive information to guide movements.
- Discrepancies between visual input and motor commands can lead to perceptual recalibration.
Purpose of the Study:
- To investigate the conditions under which pointing training induces an alignment aftereffect.
- To explore the role of sensory feedback and limb specificity in sensorimotor adaptation.
Main Methods:
- Participants trained to point at visual targets (red and blue dots) displaced by a reversible prism.
- Pre- and post-training trials assessed alignment perception without visual cues.
- Control experiments manipulated feedback availability and pointing limb.
Main Results:
- Pointing training resulted in an alignment aftereffect, with perceived positions shifting towards the direction of prior prismatic displacement.
- The aftereffect was contingent on receiving feedback during the pointing task.
- Pointing with the same arm to both targets was necessary for the aftereffect to manifest.
Conclusions:
- Sensorimotor conflicts, when uncompensated by perceived limb position changes, can induce aftereffects in visual alignment.
- The findings suggest that specific sensorimotor contingencies, including feedback and limb involvement, are crucial for recalibrating visual perception.