Sustained visual-spatial attention produces costs and benefits in response time and evoked neural activity

This study investigated the simple reaction time (RT) and event-related potential (ERP) correlates of biasing attention towards a location in the visual field. RTs and ERPs were recorded to stimuli flashed randomly and with equal probability to the left and right visual hemifields in the three blocked, covert attention conditions: (i) attention divided equally to left and right hemifield locations; (ii) attention biased towards the left location; or (iii) attention biased towards the right location. Attention was biased towards left or right by instructions to the subjects, and responses were required to all stimuli. Relative to the divided attention condition, RTs were significantly faster for targets occurring where more attention was allocated (benefits), and slower to targets where less attention was allocated (costs). The early P1 (100-140 msec) component over the lateral occipital scalp regions showed attentional benefits. There were no amplitude modulations of the occipital N1 (125-180 msec) component with attention. Between 200 and 500 msec latency, a late positive deflection (LPD) showed both attentional costs and benefits. The behavioral findings show that when sufficiently induced to bias attention, human observers demonstrate RT benefits as well as costs. The corresponding P1 benefits suggest that the RT benefits of spatial attention may arise as the result of modulations of visual information processing in the extrastriate visual cortex.

[1]  Steven A. Hillyard,et al.  Effects of spatial cuing on luminance detectability: Psychophysical and electrophysiological evidence for early selection. , 1994 .

[2]  H. Jasper Report of the committee on methods of clinical examination in electroencephalography , 1958 .

[3]  S. Hillyard,et al.  Allocation of visual attention to spatial locations: Tradeoff functions for event-related brain potentials and detection performance , 1990, Perception & psychophysics.

[4]  M. Russell Harter,et al.  Effects of attention and arousal on visually evoked cortical potentials and reaction time in man , 1969 .

[5]  Martin Eimer,et al.  Effects of attention and stimulus probability on ERPs in a Go/Nogo task , 1993, Biological Psychology.

[6]  Y. Tsal,et al.  Perceptual load as a major determinant of the locus of selection in visual attention , 1994, Perception & psychophysics.

[7]  H. Hawkins,et al.  Visual attention modulates signal detectability. , 1990 .

[8]  R. Eason Visual evoked potential correlates of early neural filtering during selective attention , 1981 .

[9]  G. Mangun,et al.  Luminance and spatial attention effects on early visual processing. , 1995, Brain research. Cognitive brain research.

[10]  M. Eimer “Sensory gating” as a mechanism for visuospatial orienting: Electrophysiological evidence from trial-by-trial cuing experiments , 1994, Perception & psychophysics.

[11]  Philip L. Smith Psychophysically principled models of visual simple reaction time. , 1995 .

[12]  C. C. Wood,et al.  The ɛ-Adjustment Procedure for Repeated-Measures Analyses of Variance , 1976 .

[13]  M. Gazzaniga,et al.  Combined spatial and temporal imaging of brain activity during visual selective attention in humans , 1994, Nature.

[14]  M. Posner,et al.  Orienting of Attention* , 1980, The Quarterly journal of experimental psychology.

[15]  S. Hillyard,et al.  Visual evoked potentials and selective attention to points in space , 1977 .

[16]  G. Mangun Neural mechanisms of visual selective attention. , 1995, Psychophysiology.

[17]  M Eimer,et al.  Spatial cueing, sensory gating and selective response preparation: an ERP study on visuo-spatial orienting. , 1993, Electroencephalography and clinical neurophysiology.

[18]  C. A. Marzi,et al.  Distribution in the visual field of the costs of voluntarily allocated attention and of the inhibitory after-effects of covert orienting , 1987, Neuropsychologia.

[19]  B. C. Motter Focal attention produces spatially selective processing in visual cortical areas V1, V2, and V4 in the presence of competing stimuli. , 1993, Journal of neurophysiology.

[20]  S. Luck,et al.  Electrocortical substrates of visual selective attention , 1993 .

[21]  S. Hillyard Electrical and magnetic brain recordings: contributions to cognitive neuroscience , 1993, Current Opinion in Neurobiology.

[22]  M. W. Molen,et al.  Discovery of the P300: A tribute , 1991, Biological Psychology.

[23]  C. J. Downing Expectancy and visual-spatial attention: effects on perceptual quality. , 1988, Journal of experimental psychology. Human perception and performance.

[24]  S J Luck,et al.  Visual event-related potentials index focused attention within bilateral stimulus arrays. I. Evidence for early selection. , 1990, Electroencephalography and clinical neurophysiology.

[25]  G. Mangun,et al.  Electrophysiological and behavioral "costs" and "benefits" during sustained visual-spatial attention. , 1994, The International journal of neuroscience.

[26]  W. Pritchard Psychophysiology of P300. , 1981, Psychological bulletin.

[27]  S. Hillyard,et al.  Modulations of sensory-evoked brain potentials indicate changes in perceptual processing during visual-spatial priming. , 1991, Journal of experimental psychology. Human perception and performance.

[28]  Spatial Sustained Attention: Better Focused Than Divided? , 1991, Perceptual and motor skills.

[29]  S A Hillyard,et al.  Spatial gradients of visual attention: behavioral and electrophysiological evidence. , 1988, Electroencephalography and clinical neurophysiology.

[30]  Raja Parasuraman,et al.  Varieties of attention , 1984 .

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

[32]  M. Posner,et al.  Attention and the detection of signals. , 1980, Journal of experimental psychology.

[33]  M. Eimer ERP modulations indicate the selective processing of visual stimuli as a result of transient and sustained spatial attention. , 1996, Psychophysiology.

[34]  G Mulder,et al.  A psychophysiological study of the use of partial information in stimulus-response translation. , 1992, Journal of experimental psychology. Human perception and performance.

[35]  G. McCarthy,et al.  Augmenting mental chronometry: the P300 as a measure of stimulus evaluation time. , 1977, Science.

[36]  D. Bouwhuis,et al.  Attention and performance X : control of language processes , 1986 .

[37]  D. Broadbent Task combination and selective intake of information. , 1982, Acta psychologica.

[38]  M. T. Reinitz,et al.  Effects of spatially directed attention on visual encoding , 1990, Perception & psychophysics.