Decoding Trans-Saccadic Prediction Error.

Area of Science:

• Neuroscience
• Cognitive Science
• Visual Perception

Background:

• Our subjective visual experience remains stable despite constant eye movements (saccades).
• Saccadic suppression of displacement often prevents us from noticing stimulus shifts during or after saccades.
• Saccadic adaptation demonstrates that the oculomotor system corrects for prediction errors, even when displacements are not consciously perceived.

Purpose of the Study:

• To identify a neural signature of trans-saccadic prediction error.
• To determine if this signal informs the motor system independently of explicit perception.
• To investigate the early visual processing of displacement information during saccades.

Main Methods:

• Participants performed saccades while viewing visual targets.
• Electroencephalography (EEG) was recorded during the task.
• Multivariate pattern analysis (MVPA) was used to analyze EEG data for displacement detection.

Main Results:

• MVPA successfully differentiated between visual target displacements and non-displacements in EEG data.
• This neural representation of trans-saccadic prediction error emerged approximately 100 ms after displacement.
• The signal was primarily observed in occipital and parieto-occipital EEG channels.
• The brain signal was present even when participants did not consciously perceive the displacement.

Conclusions:

• Trans-saccadic prediction error is neurally represented in early visual processing stages.
• This neural signal is computed and utilized for oculomotor adjustments, despite not reaching conscious perception.
• This finding provides insight into the mechanisms underlying visual stability during saccadic eye movements.