Motor space structures perceptual space: evidence from human saccadic adaptation.

Area of Science:

• Neuroscience
• Oculomotor Research
• Perception Science

Background:

• Saccadic adaptation corrects systematic errors in eye movements.
• Previous research suggests saccadic adaptation may influence spatial perception.
• The spatial extent and characteristics of this perceptual influence are not fully understood.

Purpose of the Study:

• To investigate how saccadic adaptation affects the perceived localization of visual stimuli.
• To determine if the spatial pattern of perceptual mislocalization mirrors the saccadic adaptation field.
• To explore the relationship between motor adaptation and spatial perception.

Main Methods:

• Horizontal saccadic adaptation was induced using a target 12 degrees to the right.
• The spatial "adaptation field" was mapped using 38 test saccades.
• Visual probe localization was assessed before and after adaptation within and outside the adaptation field.

Main Results:

• The saccadic adaptation field was asymmetric, with greater adaptation transfer to larger saccades.
• Perceived probe localization was systematically shifted after saccadic adaptation.
• The degree of perceptual mislocalization correlated with the amount of saccadic adaptation transfer.

Conclusions:

• Saccadic adaptation influences spatial perception, creating mislocalizations.
• The spatial structure of perceptual changes resembles the saccadic adaptation field.
• Shared neural mechanisms likely underlie saccadic motor control and spatial perception.