Perceptual decisions about object shape bias visuomotor coordination during rapid interception movements

Area of Science:

• Neuroscience
• Cognitive Science
• Motor Control

Background:

• Visual processing is divided into dorsal (action) and ventral (perception) streams.
• The interaction between these streams during tasks requiring both perception and action is not fully understood.

Purpose of the Study:

• To investigate how perceptual decision-making influences arm and eye movement strategies.
• To explore the interaction between ventral and dorsal visual streams during visuomotor tasks.

Main Methods:

• Participants performed reaching and interception tasks with a robotic manipulandum on an augmented-reality display.
• Object identification (circle/ellipse) served as a cue for different movement goals.
• Arm and eye movement kinematics were recorded and analyzed.

Main Results:

• Perceptual decision-making increased urgency and errors during interception tasks.
• Faster reaction times were linked to post-initiation movement adjustments, especially during interception.
• Eye movements (saccades) adapted to perceptual decision-making requirements, with faster reaction times and altered velocity/lag.

Conclusions:

• The integration of visual information from ventral and dorsal streams is modulated by task demands.
• Eye movement adaptations support perceptual decision-making during complex visuomotor tasks.
• Task complexity influences the interplay between perception and action pathways in visual control of movement.