Full Field Masking Causes Reversals in Perceived Event Order

Area of Science:

• Cognitive Neuroscience
• Visual Perception

Background:

• The human visual system maintains stability despite disruptions like saccades (rapid eye movements) and blinks.
• Peri-saccadic perceptual distortions, such as temporal compression, are well-documented.
• Some saccade-specific distortions are mimicked by visual masking, suggesting shared underlying mechanisms.

Purpose of the Study:

• To investigate whether temporal order reversal, a peri-saccadic distortion, can be induced by visual masking.
• To determine if this phenomenon is distinct from simple target detection failure.

Main Methods:

• Human participants performed a temporal order judgment task.
• The timing intervals between stimuli and a mask were systematically varied.
• Participants reported the perceived order of brief visual events.

Main Results:

• Temporal order reversal occurred in approximately 25% of trials at the shortest stimulus-to-mask intervals.
• Participants frequently reported these reversals with high subjective confidence.
• The results indicate the phenomenon is not solely due to a failure in target detection.

Conclusions:

• Temporal order reversal is not exclusive to saccades and can be elicited by visual masking.
• These findings challenge models of visual stability by demonstrating a non-saccade-specific mechanism for temporal distortion.
• The results provide new constraints for understanding how the brain processes temporal information during visual disruptions.