Peri-saccadic compression to two locations in a two-target choice saccade task.

Area of Science:

• Neuroscience
• Visual Perception
• Oculomotor System

Background:

• Saccadic eye movements involve visual stimuli appearing compressed at the target location.
• This peri-saccadic compression is thought to stem from feedback between brain's oculomotor and visual areas.
• This feedback prioritizes vision near the saccade target, potentially impairing localization elsewhere.

Purpose of the Study:

• To investigate visual perception when multiple potential saccade targets are present.
• To determine if peri-saccadic compression patterns change with multiple targets.
• To understand the role of oculomotor feedback in multi-target scenarios.

Main Methods:

• Presented participants with visual scenes containing multiple potential saccade targets.
• Monitored eye movements and visual perception during saccade preparation and execution.
• Analyzed the spatial distribution of peri-saccadic compression.

Main Results:

• Two distinct foci of peri-saccadic compression were observed when multiple targets were available.
• These compression zones formed regardless of which target was ultimately selected for the saccade.
• Preparatory activity in oculomotor maps correlated with the development of multiple compression foci.

Conclusions:

• Oculomotor feedback signals related to potential saccade targets can occur in parallel.
• Existing theories of oculomotor feedback as efference copy signals need to account for parallel feedback mechanisms.
• This finding has implications for understanding visual attention and decision-making during eye movements.