Common-onset masking terminates the temporal evolution of orientation repulsion

Area of Science:

• Cognitive Neuroscience
• Visual Perception

Background:

• Conscious awareness of visual events is not immediate.
• Previous research focused on visibility using backward masking.
• Understanding phenomenal attributes beyond visibility is crucial for a complete picture of consciousness.

Purpose of the Study:

• To investigate the emergence of phenomenal attributes beyond visibility.
• To quantify appearance using orientation repulsion during common-onset masking.
• To determine how backward masking affects these attributes.

Main Methods:

• Used common-onset masking with near-vertical target gratings and tilted inducers.
• Quantified orientation repulsion as a measure of appearance.
• Assessed orientation discriminability under masking conditions.

Main Results:

• Backward masking reduced orientation repulsion, indicating altered appearance.
• This reduction occurred only when inducers were presented with or after the target.
• Orientation discriminability remained unaffected by masking.

Conclusions:

• Orientation repulsion involves slow contextual modulation, influenced later by masking.
• Backward masking terminates the temporal evolution of internal representations before awareness.
• This leads to premature representations entering awareness, altering appearance without affecting discriminability.