title: Late electrophysiological modulations of feature-based attention to object shapes.
abstract: Feature-based attention has been shown to aid object perception. Our previous ERP effects revealed temporally late feature-based modulation in response to objects relative to motion. The aim of the current study was to confirm the timing of feature-based influences on object perception while cueing within the feature dimension of shape. Participants were told to expect either "pillow" or "flower" objects embedded among random white and black lines. Participants more accurately reported the object's main color for valid compared to invalid shapes. ERPs revealed modulation from 252-502 ms, from occipital to frontal electrodes. Our results are consistent with previous findings examining the time course for processing similar stimuli (illusory contours). Our results provide novel insights into how attending to features of higher complexity aids object perception presumably via feed-forward and feedback mechanisms along the visual hierarchy.
authors.affiliation: Brain and Mind Institute, Department of Psychology, Western University, London, Ontario, Canada; Department of Psychology, University of Toronto Scarborough, Toronto, Ontario, Canada.
authors.forename: Bobby Boge
authors.initials: BB
authors.lastname: Stojanoski
authors.forename: Matthias
authors.initials: M
authors.lastname: Niemeier
mesh_terms: D001288:Attention / Q000502:physiology*; D004569:Electroencephalography; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005260:Female; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008297:Male; D010775:Photic Stimulation; D011930:Reaction Time / Q000502:physiology; D014793:Visual Cortex / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology; D055815:Young Adult
keywords: Cluster analysis; EEG/ERP; Feature-based attention; Object perception