Attentional shifts between surfaces: effects on detection and early brain potentials

Area of Science:

• Cognitive Neuroscience
• Visual Perception

Background:

• Discrimination of consecutive visual events is easier on the same illusory surface.
• Interference occurs when events involve different surfaces, a phenomenon termed

Purpose of the Study:

• To characterize the "two-surface cost" in visual event discrimination.
• To compare this cost to the attentional blink (AB).
• To investigate the neural basis of the two-surface cost.

Main Methods:

• Experimental manipulation of illusory surfaces and transparent motion.
• Behavioral measures of discrimination sensitivity (d').
• Electrophysiological recordings of brain responses (N1).

Main Results:

• Reduced sensitivity (d') was observed in the two-surface condition.
• This "two-surface cost" correlated with a reduced N1 brain response.
• The N1 reduction differed from findings reported for the attentional blink.

Conclusions:

• The "two-surface cost" reflects competitive interactions within early visual processing.
• This mechanism is distinct from the post-perceptual suppression observed in the attentional blink.
• Findings suggest different neural pathways for processing events on same versus different surfaces.