title: Locus of response slowing resulting from alternation-based processing interference.
abstract: In serial reaction time (RT) tasks, performance is strongly influenced by previous events. RT in Trial N is much slower after response changes than response repetitions from Trial N-2 to Trial N-1 when response-stimulus interval is short (I. Jentzsch & H. Leuthold, 2005). The aim of the present study was to investigate the mechanisms leading to this slowing by contrasting the idea of a hard bottleneck, postponing all subsequent processing, with a selective prolonging of postperceptual stages. We analyzed the lateralized readiness potential (LRP) and peak latencies of P1, N1, and P300 components in a choice RT task mapping four stimuli to two responses. Alternation-based interference affected the S-LRP interval but neither the LRP-R interval nor the latency of P1, N1, and P300. These findings suggest that, whereas alternation-based conflict originates at response-related stages, postconflict slowing selectively affects central, premotoric processing.
authors.affiliation: School of Psychology, University of St. Andrews, St. Andrews, UK. cd71@st-andrews.ac.uk
authors.forename: Carolin
authors.initials: C
authors.lastname: Dudschig
authors.forename: Ines
authors.initials: I
authors.lastname: Jentzsch
mesh_terms: D000328:Adult; D003265:Contingent Negative Variation / Q000502:physiology; D003627:Data Interpretation, Statistical; D004569:Electroencephalography; D018913:Event-Related Potentials, P300 / Q000502:physiology; D005071:Evoked Potentials / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D008606:Mental Processes / Q000502:physiology*; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology*