Psychophysical thresholds will be measured in quantitative studies of binocular interaction in human pattern vision. Half fields of a split-screen visual display will be presented dichoptically to the two eyes of observers. The stimulus patterns will be sinewave gratings, characterized by their spatial frequency, relative phase, contrast, orientation, and temporal waveform. There are three broad research objectives: 1) to understand how stereopsis is influenced by pattern parameters of the two half fields; 2) to understand how monocular contrast thresholds depend upon parameters of the stimulus presented to the contralateral eye; 3) to develop a general psychophysical procedure for the characterization of nonlinear perceptual systems. These objectives will be pursued in seven experiments concerned with: 1) the influence of the binocular accommodation response on contrast thresholds; 2) interocular """"""""summation"""""""" of temporal, spatial and orientational parameters of the masking stimulus, as well as its stereoscopic disparity; 4) dependence of stereoscopic and vernier acuity and discrimination thresholds upon spatial frequency, contrast and orientation.
| Kalia, Amy A; Schrater, Paul R; Legge, Gordon E (2013) Combining path integration and remembered landmarks when navigating without vision. PLoS One 8:e72170 |
| Kalia, Amy A; Legge, Gordon E; Roy, Rudrava et al. (2010) Assessment of Indoor Route-finding Technology for People with Visual Impairment. J Vis Impair Blind 104:135-147 |
| Kalia, Amy A; Legge, Gordon E; Giudice, Nicholas A (2008) Learning building layouts with non-geometric visual information: the effects of visual impairment and age. Perception 37:1677-99 |
| Kallie, Christopher S; Schrater, Paul R; Legge, Gordon E (2007) Variability in stepping direction explains the veering behavior of blind walkers. J Exp Psychol Hum Percept Perform 33:183-200 |
| Stankiewicz, Brian J; Legge, Gordon E; Mansfield, J Stephen et al. (2006) Lost in virtual space: studies in human and ideal spatial navigation. J Exp Psychol Hum Percept Perform 32:688-704 |
| Liu, Zili; Kersten, Daniel (2003) Three-dimensional symmetric shapes are discriminated more efficiently than asymmetric ones. J Opt Soc Am A Opt Image Sci Vis 20:1331-40 |
| Kersten, Daniel; Yuille, Alan (2003) Bayesian models of object perception. Curr Opin Neurobiol 13:150-8 |
| Brady, Mark J; Kersten, Daniel (2003) Bootstrapped learning of novel objects. J Vis 3:413-22 |
| Stankiewicz, Brian J (2002) Empirical evidence for independent dimensions in the visual representation of three-dimensional shape. J Exp Psychol Hum Percept Perform 28:913-32 |
| Braje, W L; Legge, G E; Kersten, D (2000) Invariant recognition of natural objects in the presence of shadows. Perception 29:383-98 |
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