title: Stroop matching task: role of feature selection and temporal modulation.
abstract: We conducted an event-related potential (ERP) study to investigate the electrocortical dynamics of attentional feature-based processing in the Stroop matching task. Participants in the study (n = 37) compared the ink color of a colored word with the meaning of a color-word in white ink. The two task stimuli were presented simultaneously or with SOAs (Stimulus Onset Asynchrony) of 400 and 1,200 ms. The Stroop matching effect was maximal during SOA-0, was reduced at SOA-400, and was inverted at SOA-1200. We focused the ERP analysis on the N1 component. Paralleling the behavioral results, the N1 amplitude was greater for congruent stimuli than incongruent stimuli during SOA-0. This difference was attenuated at SOA-400, and at SOA-1200, an inverse pattern was observed. The results provide evidence that early selection processing participated in the Stroop matching task phenomenon and also suggest that the temporal modulation of early attention is a function of task characteristics such as SOA.
authors.affiliation: Departamento de Fisiologia e Farmacologia, Instituto Biomédico, Universidade Federal Fluminense, Prof Ernani de Melo 101, 24210-130, São Domingos, Niterói, RJ, Brazil. isabeldavid@vm.uff.br
authors.forename: Isabel A
authors.initials: IA
authors.lastname: David
authors.forename: Eliane
authors.initials: E
authors.lastname: Volchan
authors.forename: Jaime
authors.initials: J
authors.lastname: Vila
authors.forename: Andreas
authors.initials: A
authors.lastname: Keil
authors.forename: Letícia
authors.initials: L
authors.lastname: de Oliveira
authors.forename: Aydamari J P
authors.initials: AJ
authors.lastname: Faria-Júnior
authors.forename: Pandelis
authors.initials: P
authors.lastname: Perakakis
authors.forename: Elisa C
authors.initials: EC
authors.lastname: Dias
authors.forename: Izabela
authors.initials: I
authors.lastname: Mocaiber
authors.forename: Mirtes G
authors.initials: MG
authors.lastname: Pereira
authors.forename: Walter
authors.initials: W
authors.lastname: Machado-Pinheiro
mesh_terms: D001288:Attention / Q000502:physiology*; D003073:Cognitive Dissonance; D003116:Color; D004569:Electroencephalography; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology; D011930:Reaction Time / Q000502:physiology; D011932:Reading; D057190:Stroop Test; D055815:Young Adult