Saccade direction modulates the temporal dynamics of presaccadic attention

Area of Science:

• Cognitive Neuroscience
• Oculomotor Research
• Visual Perception

Background:

• Presaccadic attention enhances visual perception at saccade targets.
• Previous research suggests attentional enhancement strength varies with saccade direction.
• The temporal dynamics of this presaccadic attention remain largely unexplored across different saccade directions.

Purpose of the Study:

• To investigate whether the time course of presaccadic attention differs across saccade directions (upward vs. downward).
• To characterize the temporal dynamics of attentional enhancement during saccade preparation.
• To test if observed asymmetries in attentional deployment reflect differences in preparation or baseline sensitivity.

Main Methods:

• Participants performed an orientation discrimination task during saccade preparation.
• Task difficulty was equated across vertical meridians using individually titrated tilt angles.
• Visual sensitivity was measured at various time points relative to saccade and cue onset to analyze temporal dynamics.

Main Results:

• Presaccadic attention built up significantly faster and reached higher levels preceding downward saccades compared to upward saccades.
• Linear model analysis indicated differences in the rate of attentional deployment (slopes) but not baseline sensitivity (intercepts).
• Saccade parameters did not explain the observed directional asymmetries in attentional dynamics.

Conclusions:

• The temporal dynamics of presaccadic attention are not uniform and vary significantly with saccade direction.
• This temporal flexibility suggests presaccadic attentional deployment is influenced by movement goals, challenging uniform attention models.
• Findings highlight the coordinated, direction-specific interplay between visual and oculomotor systems during goal-directed actions.