Saccade-synchronized rapid attention shifts in macaque visual cortical area MT

Area of Science:

• Neuroscience
• Cognitive Science
• Visual Perception

Background:

• Humans and monkeys maintain spatial attention on visual stimuli during saccadic eye movements.
• This requires shifting attentional modulation between pre-saccadic and post-saccadic neuronal representations.
• The timing and saccade-synchronization of this trans-saccadic attention shift are not well understood.

Purpose of the Study:

• To investigate whether trans-saccadic attention shifts are rapid and synchronized with saccades.
• To determine the precise timing of attentional modulation shifts across saccades in the visual cortex.

Main Methods:

• Trained two rhesus monkeys to perform saccades while maintaining covert attention at a fixed location.
• Recorded neuronal activity in the visual medial temporal (MT) area to track attentional modulation shifts.

Main Results:

• Trans-saccadic attention shifts in the visual MT area are highly synchronized with saccades.
• Attentional modulation shifted from pre-saccadic to post-saccadic neuronal representations approximately 50 milliseconds after saccade onset.
• This timing, considering response latency, effectively maintains spatial attention across saccades.

Conclusions:

• The trans-saccadic attention shift mechanism is well-timed to maintain continuous spatial attention on relevant stimuli during naturalistic visual scene scanning.
• This neural mechanism supports optimal tracking and processing of visual information across saccadic eye movements.