Motor recalibration of visual and saccadic maps

Area of Science:

• Neuroscience
• Computational Neuroscience
• Vision Science

Background:

• The brain must maintain accurate spatial representations for both perception and action.
• Saccadic eye movements and visual perception rely on recalibrating spatial information based on movement errors.

Purpose of the Study:

• To investigate whether spatial information for vision and saccades is processed in shared or separate neural resources.
• To determine how post-saccadic errors contribute to the recalibration of visual and saccadic space.

Main Methods:

• Saccade adaptation was employed to modify saccade amplitudes and visual mislocalization.
• Participants performed saccades, and 'no error' trials were inserted to manipulate post-saccadic error feedback.
• Retinal error and prediction error were annulled in separate experimental conditions.

Main Results:

• Saccade adaptation remained unaffected by the insertion of 'no error' trials.
• Visual mislocalization decreased with an increasing number of trials showing zero retinal error.
• Clamping the prediction error to zero eliminated visual mislocalization.

Conclusions:

• Post-saccadic error signals are utilized distinctly for recalibrating visual and saccadic space.
• This suggests that separate neural resources are involved in updating motor and perceptual spatial maps.