Competitive interaction degrades target selection: an ERP study.

Localized attentional interference (LAI) occurs when attending to a visual object degrades processing of nearby objects. Competitive interaction accounts of LAI explain the phenomenon as the result of competition among objects for representation in extrastriate cortex. Here, we examined the N2pc component of the event-related potential (ERP) as a likely neural correlate of LAI. In Experiment 1, participants responded to the orientation of a target while ignoring a nearby decoy. At small target-decoy separations, N2pc amplitude was attenuated whereas the amplitude of a later, positive component (Ptc) was potentiated. Experiment 2 ruled out sensory explanations of these effects. The N2pc results are consistent with the idea that spatially mediated competition for representation in extrastriate cortex degrades target selection. Moreover, the Ptc may reflect a bias signal needed to resolve the competition at smaller target-decoy separations.

[1]  M. Eimer.  The N2pc component as an indicator of attentional selectivity. , 1996, Electroencephalography and clinical neurophysiology.

[2]  Vincent Di Lollo,et al.  Electrophysiological Indices of Target and Distractor Processing in Visual Search , 2009, Journal of Cognitive Neuroscience.

[3]  E Donchin,et al.  A new method for off-line removal of ocular artifact. , 1983, Electroencephalography and clinical neurophysiology.

[4]  Jason S. McCarley,et al.  Attention-mediated capacity limits in visual form processing , 2004 .

[5]  J. R. Mounts.  Evidence for suppressive mechanisms in attentional selection: Feature singletons produce inhibitory surrounds , 2000, Perception & psychophysics.

[6]  Arthur F Kramer,et al.  Spatially mediated capacity limits in attentive visual perception. , 2007, Acta psychologica.

[7]  G. Woodman,et al.  Dissociations Among Attention, Perception, and Awareness During Object-Substitution Masking , 2003, Psychological science.

[8]  R. Desimone,et al.  Selective attention gates visual processing in the extrastriate cortex. , 1985, Science.

[9]  S. Luck,et al.  Neural sources of focused attention in visual search. , 2000, Cerebral cortex.

[10]  Brandon E Gavett,et al.  The role of salience in localized attentional interference , 2004, Vision Research.

[11]  M. Masson,et al.  Using confidence intervals in within-subject designs , 1994, Psychonomic bulletin & review.

[12]  Leslie G. Ungerleider,et al.  Mechanisms of directed attention in the human extrastriate cortex as revealed by functional MRI. , 1998, Science.

[13]  Eileen Kowler,et al.  Attentional interference at small spatial separations , 1999, Vision Research.

[14]  R. Desimone,et al.  Neural mechanisms of selective visual attention. , 1995, Annual review of neuroscience.

[15]  L. Robertson.  Binding, spatial attention and perceptual awareness , 2003, Nature Reviews Neuroscience.

[16]  A. T. Smith,et al.  Estimating receptive field size from fMRI data in human striate and extrastriate visual cortex. , 2001, Cerebral cortex.

[17]  S. Luck,et al.  Electrophysiological correlates of feature analysis during visual search. , 1994, Psychophysiology.

[18]  R. Desimone,et al.  Visual areas in the temporal cortex of the macaque , 1979, Brain Research.

[19]  J. McCarley,et al.  Age-related differences in localized attentional interference. , 2004, Psychology and aging.

[20]  Jason S McCarley,et al.  Localized Attentional Interference Affects Object Individuation, Not Feature Detection , 2007, Perception.

[21]  Jason S McCarley,et al.  Attentional templates regulate competitive interactions among attended visual objects , 2007, Perception & psychophysics.

[22]  J. McCarley,et al.  Localized attentional interference reflects competition for reentrant processing , 2009, Psychonomic bulletin & review.

[23]  J. Enns.  Object substitution and its relation to other forms of visual masking , 2004, Vision Research.