title: Computational mechanisms of object constancy for visual recognition revealed by event-related potentials.
abstract: This study examined the functional organisation of the computational processes underlying orientation-dependent and orientation-invariant two-dimensional object recognition. Participants identified two previously memorised novel shapes at different image plane orientations while event-related potentials (ERPs) were recorded. A centro-parietal ERP component was found that peaked between 350 and 450 ms post-stimulus onset and whose amplitude was modulated by stimulus orientation only for objects showing an orientation effect in response times. These findings are consistent with a serial model of object recognition whereby object constancy is achieved in at least two successive steps: orientation-invariant feature extraction and orientation-dependent visuo-spatial transformation.
authors.affiliation: School of Psychology, University of Wales, Bangor, UK. e.c.leek@bangor.ac.uk
authors.forename: E Charles
authors.initials: EC
authors.lastname: Leek
authors.forename: Christine J
authors.initials: CJ
authors.lastname: Atherton
authors.forename: Guillaume
authors.initials: G
authors.lastname: Thierry
mesh_terms: D000293:Adolescent; D000328:Adult; D004569:Electroencephalography; D004596:Electroretinography; D005074:Evoked Potentials, Visual / Q000502:physiology*; D006801:Humans; D008875:Middle Aged; D009949:Orientation; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics; D011930:Reaction Time / Q000502:physiology