Cortical image density determines the probability of target discovery during active search

An analysis of target detection as a function of target eccentricity was made on eye movement data collected from three monkey subjects during active visual search. Target detection probability was invariant across array set size and eccentricity conditions when the cortical density of relevant stimuli surrounding the target was held constant. When target color was used to guide search, the effective cortical density was the density of stimuli that shared the target's color. Thus the passive constraint of cortical magnification in combination with an active selection for a stimulus attribute, in this case color, sets the spatial framework for detection of the target.

[1]  G Wolford,et al.  Lateral masking as a function of spacing , 1983, Perception & psychophysics.

[2]  B. C. Motter,et al.  The guidance of eye movements during active visual search , 1998, Vision Research.

[3]  M. Carrasco,et al.  The eccentricity effect: Target eccentricity affects performance on conjunction searches , 1995, Perception & psychophysics.

[4]  J. Wolfe,et al.  Why are there eccentricity effects in visual search? Visual and attentional hypotheses , 1998, Perception & psychophysics.

[5]  John H. R. Maunsell,et al.  The visual field representation in striate cortex of the macaque monkey: Asymmetries, anisotropies, and individual variability , 1984, Vision Research.

[6]  J. Wolfe,et al.  Guided Search 2.0 A revised model of visual search , 1994, Psychonomic bulletin & review.

[7]  K. Nakayama,et al.  Stimulus discriminability in visual search , 1994, Vision Research.

[8]  J. Palmer,et al.  Measuring the effect of attention on simple visual search. , 1993, Journal of experimental psychology. Human perception and performance.

[9]  C W Eriksen,et al.  Information processing in visual search: A continuous flow conception and experimental results , 1979, Perception & psychophysics.

[10]  L. G. Williams,et al.  The effect of target specification on objects fixated during visual search , 1966 .

[11]  L Harms,et al.  Color segregation and selective attention in a nonsearch task , 1983, Perception & psychophysics.

[12]  H. BOUMA,et al.  Interaction Effects in Parafoveal Letter Recognition , 1970, Nature.

[13]  A. Treisman,et al.  Conjunction search revisited. , 1990, Journal of experimental psychology. Human perception and performance.

[14]  J. Duncan,et al.  Visual search and stimulus similarity. , 1989, Psychological review.

[15]  L G Williams,et al.  The effects of target specification on objects fixated during visual search. , 1967, Acta psychologica.

[16]  G Wolford,et al.  Contour interaction as a function of retinal eccentricity , 1984, Perception & psychophysics.

[17]  B. Motter.  Neural correlates of attentive selection for color or luminance in extrastriate area V4 , 1994, The Journal of neuroscience : the official journal of the Society for Neuroscience.

[18]  S. Klein,et al.  Vernier acuity, crowding and cortical magnification , 1985, Vision Research.

[19]  G. Humphreys.  Flexibility of attention between stimulus dimensions , 1981, Perception & psychophysics.

[20]  H. Egeth,et al.  Searching for conjunctively defined targets. , 1984, Journal of experimental psychology. Human perception and performance.

[21]  D. Levi,et al.  The two-dimensional shape of spatial interaction zones in the parafovea , 1992, Vision Research.

[22]  B. C. Motter,et al.  The zone of focal attention during active visual search , 1998, Vision Research.

[23]  R. Shiffrin,et al.  Controlled and automatic human information processing: I , 1977 .

[24]  MARISA CARRASCO,et al.  Cortical Magnification Neutralizes the Eccentricity Effect in Visual Search , 1997, Vision Research.

[25]  F. Kitterle.  Psychophysics of lateral tachistoscopic presentation , 1986, Brain and Cognition.

[26]  A. Treisman.  Search, similarity, and integration of features between and within dimensions. , 1991, Journal of experimental psychology. Human perception and performance.