Multisensory interactions in saccade target selection: curved saccade trajectories

Area of Science:

• Neuroscience
• Cognitive Psychology
• Oculomotor Research

Background:

• Saccade generation involves complex neural processes.
• Multisensory integration plays a role in sensorimotor control.
• Distractor stimuli can influence motor responses.

Purpose of the Study:

• To investigate how visual, auditory, and somatosensory distractors affect saccade trajectories.
• To examine multisensory interactions during saccade generation.
• To understand the neural mechanisms underlying distractor effects on eye movements.

Main Methods:

• Participants made saccades to visual targets under various distractor conditions (visual, auditory, somatosensory).
• Distractor stimuli were presented at non-target locations, sometimes indicating the target.
• Saccade trajectories were analyzed for curvature and modulation by distractors.

Main Results:

• Distractors, particularly visual ones, induced significant curvature in saccade trajectories.
• Auditory and somatosensory distractors also modulated saccade paths, especially when preceding target onset.
• Reflexive saccades were more susceptible to crossmodal distractor effects than voluntary saccades.

Conclusions:

• Multisensory distractors can modulate saccade trajectories, indicating crossmodal influences on oculomotor control.
• These effects may arise from inhibitory processes within a common neural map for target selection.
• The findings provide insights into the neural basis of sensorimotor integration and attention.