Directing attention to a visual stimulus produces a positive ERP waveform called the P1 waveform if participants are
A)overtly, rather than covertly, directing attention.
B)selectively attending to the stimulus based on its location.
C)exogenously (externally) cued rather than endogenously (internally) cued to the stimulus.
D)shown a different stimulus in each eye.

Question

Quizplus · Accepted Answer

The P1 waveform is typically observed when participants selectively attend to a visual stimulus based on its location. This suggests that the P1 reflects early sensory processing that is modulated by attention. A and C are incorrect because there is evidence that the P1 can be elicited by covert attention (e.g., without eye movements) and endogenous cues (e.g., top-down instructions to attend to a specific stimulus feature). D is also incorrect because the P1 does not depend on binocular rivalry or other situations where different stimuli are presented to each eye.

Directing Attention to a Visual Stimulus Produces a Positive ERP