Large crowding zones in peripheral vision for briefly presented stimuli.

When a target is flanked by distractors, it becomes more difficult to identify. In the periphery, this crowding effect extends over a wide range of target-flanker separations, called the spatial extent of interaction (EoI). A recent study showed that the EoI dramatically increases in size for short presentation durations (Chung & Mansfield, 2009). Here we investigate this duration-EoI relation in greater detail and show that (a) it holds even when visibility of the unflanked target is equated for different durations, (b) the function saturates for durations shorter than 30 to 80 ms, and (c) the largest EoIs represent a critical spacing greater than 50% of eccentricity. We also investigated the effect of same or different polarity for targets and flankers across different presentation durations. We found that EoIs for target and flankers having opposite polarity (one white, the other black) show the same temporal pattern as for same polarity stimuli, but are smaller at all durations by 29% to 44%. The observed saturation of the EoI for short-duration stimuli suggests that crowding follows the locus of temporal integration. Overall, the results constrain theories that map crowding zones to fixed spatial extents or to lateral connections of fixed length in the cortex.

[1]  M. Herzog,et al.  When crowding of crowding leads to uncrowding. , 2013, Journal of vision.

[2]  Kowa Koida,et al.  Color vision test for dichromatic and trichromatic macaque monkeys. , 2013, Journal of vision.

[3]  Bosco S. Tjan,et al.  Crowding during restricted and free viewing , 2013, Vision Research.

[4]  Edward Vul,et al.  Quantifying error distributions in crowding. , 2013, Journal of vision.

[5]  George Sperling,et al.  Black-white asymmetry in visual perception. , 2012, Journal of vision.

[6]  C. Gilbert,et al.  Adult Visual Cortical Plasticity , 2012, Neuron.

[7]  Lei Liu,et al.  Whole report uncovers correctly identified but incorrectly placed target information under visual crowding. , 2012, Journal of vision.

[8]  Hongjing Lu,et al.  Two forms of aftereffects induced by transparent motion reveal multilevel adaptation. , 2012, Journal of vision.

[9]  Paul V McGraw,et al.  Perceptual Learning Reduces Crowding in Amblyopia and in the Normal Periphery , 2012, The Journal of Neuroscience.

[10]  D. Levi,et al.  Visual crowding: a fundamental limit on conscious perception and object recognition , 2011, Trends in Cognitive Sciences.

[11]  J. Cass,et al.  Probabilistic, positional averaging predicts object-level crowding effects with letter-like stimuli. , 2010, Journal of vision.

[12]  D. Alais,et al.  Orientation tuning of contrast masking caused by motion streaks. , 2010, Journal of vision.

[13]  J. Stephen Mansfield,et al.  Contrast polarity differences reduce crowding but do not benefit reading performance in peripheral vision , 2009, Vision Research.

[14]  Steven C Dakin,et al.  Positional averaging explains crowding with letter-like stimuli , 2009, Proceedings of the National Academy of Sciences.

[15]  Won Mok Shim,et al.  Supercrowding: weakly masking a target expands the range of crowding. , 2009, Journal of vision.

[16]  D. Pelli,et al.  The uncrowded window of object recognition , 2008, Nature Neuroscience.

[17]  D. Pelli.  Crowding: a cortical constraint on object recognition , 2008, Current Opinion in Neurobiology.

[18]  D. Levi.  Crowding—An essential bottleneck for object recognition: A mini-review , 2008, Vision Research.

[19]  V. M. Bondarko,et al.  Foveal contour interactions and crowding effects at the resolution limit of the visual system. , 2007, Journal of vision.

[20]  Susana T. L. Chung,et al.  Learning to identify crowded letters: Does it improve reading speed? , 2007, Vision Research.

[21]  T. Nazir,et al.  How odgcrnwi becomes crowding: stimulus-specific learning reduces crowding. , 2007, Journal of vision.

[22]  P. Cavanagh,et al.  Temporal properties of the polarity advantage effect in crowding. , 2007, Journal of vision.

[23]  D. Pelli,et al.  Crowding is unlike ordinary masking: distinguishing feature integration from detection. , 2004, Journal of vision.

[24]  Patrick Cavanagh,et al.  The extent of crowding in peripheral vision does not scale with target size , 2002, Vision Research.

[25]  P. Cavanagh,et al.  The Spatial Resolution of Visual Attention , 2001, Cognitive Psychology.

[26]  J. Lund,et al.  Compulsory averaging of crowded orientation signals in human vision , 2001, Nature Neuroscience.

[27]  R F Hess,et al.  Contour interaction in fovea and periphery. , 2000, Journal of the Optical Society of America. A, Optics, image science, and vision.

[28]  Robert F Hess,et al.  The foveal ‘crowding’ effect: physics or physiology? , 2000, Vision Research.

[29]  P. Cavanagh,et al.  Attentional resolution and the locus of visual awareness , 1996, Nature.

[30]  Dennis M. Levi,et al.  Long-range dichoptic interactions in the human visual cortex in the region corresponding to the blind spot , 1994, Vision Research.

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

[32]  Tatjana A. Nazir,et al.  Effects of lateral masking and spatial precueing on gap-resolution in central and peripheral vision , 1992, Vision Research.

[33]  I. Rentschler,et al.  Contrast thresholds for identification of numeric characters in direct and eccentric view , 1991, Perception & psychophysics.

[34]  T. Wiesel,et al.  The influence of contextual stimuli on the orientation selectivity of cells in primary visual cortex of the cat , 1990, Vision Research.

[35]  C. Eriksen,et al.  Visual attention within and around the field of focal attention: A zoom lens model , 1986, Perception & psychophysics.

[36]  D. Whitteridge,et al.  Form, function and intracortical projections of spiny neurones in the striate visual cortex of the cat. , 1984, The Journal of physiology.

[37]  J. Lund,et al.  Intrinsic laminar lattice connections in primate visual cortex , 1983, The Journal of comparative neurology.

[38]  T. Wiesel,et al.  Clustered intrinsic connections in cat visual cortex , 1983, The Journal of neuroscience : the official journal of the Society for Neuroscience.

[39]  T. Wiesel,et al.  Morphology and intracortical projections of functionally characterised neurones in the cat visual cortex , 1979, Nature.

[40]  H. Bouma,et al.  Eccentric vision: Adverse interactions between line segments , 1976, Vision Research.

[41]  H. Bouma.  Visual interference in the parafoveal recognition of initial and final letters of words. , 1973, Vision research.

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

[43]  M C FLOM,et al.  Contour Interaction and Visual Resolution: Contralateral Effects , 1963, Science.

[44]  M C FLOM,et al.  VISUAL RESOLUTION AND CONTOUR INTERACTION. , 1963, Journal of the Optical Society of America.

[45]  H. Burian,et al.  A study of separation difficulty. Its relationship to visual acuity in normal and amblyopic eyes. , 1962, American journal of ophthalmology.

[46]  D. Levi,et al.  The effect of similarity and duration on spatial interaction in peripheral vision. , 1994, Spatial vision.

[47]  Charles D. Gilbert,et al.  Lateral interactions in visual cortex. , 1990, Cold Spring Harbor symposia on quantitative biology.