The distractor positivity (Pd) signals lowering of attentional priority: evidence from event-related potentials and individual differences.
We investigated the effects of task demands and individual differences on the allocation of attention. Using the same stimuli, participants indicated the orientation of a line contained in a shape singleton (identification task) or the presence of singletons (detection task). Shape singletons in the identification task elicited a contralateral negativity (N2pc) whereas shape singletons in the detection task elicited a contralateral positivity (Pd). We suggest that the reduction of attentional priority of a salient stimulus, reflected by the Pd, occurred more rapidly with the less demanding detection task. Further, fewer distractible participants showed a larger N2pc to lateral color distractors than highly distractible participants. We suggest that highly distractible participants developed compensatory mechanisms to suppress distracting stimuli.
Faculté de Psychologie et des Sciences de l'Éducation, University of Geneva, Geneva, Switzerland; Geneva Neuroscience Center, University of Geneva, Geneva, Switzerland.
Nicolas
N
Burra
Dirk
D
Kerzel
D001288:Attention / Q000502:physiology*; D004569:Electroencephalography; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D007206:Individuality; D008297:Male; D010775:Photic Stimulation; D011930:Reaction Time / Q000502:physiology; D055815:Young Adult
Bottom-up; Distractibility; EEG; Interindividual differences; N2pc; Pd; Saliency; Top-down; Visual search