The ultimate objective of this research is to derive a faithful and economical representation of visual processes. The basic approach is to separate the visual processes into smaller and simpler functional units for study. The method depends on exploiting a nonlinear process in the retina that partitions the visual system into separate compartments in a way that allows separate investigation of each compartment, and provides a reference point in the sequence of processes. The present proposal is to continue to exploit this and related methods and to extend the approach into new regions of the visual system. Specifically, the aims are to: test spatial and temporal interactions preceding and following the nonlinear stage under different states of adaptation; use the apparent motion created by relative motion of an afterimage and a superimposed stimulus to measure eye movements and their effects on visual sensitivity, and compare the results with a theoretical analysis of the effects of linear and oscillatory eye movements on visual sensitivity; measure the size of cones containing different pigments; extend the work to exploit the next nonlinearity in the system through monocular and binocular interactions between the neural representations of patterns cast onto the retina and signals produced within the visual system by nonlinear processes.
| Lee, Byeong-Taek; McPeek, Robert M (2013) The effects of distractors and spatial precues on covert visual search in macaque. Vision Res 76:43-9 |
| Lee, Byeong-Taek; McPeek, Robert M (2013) Reprint of: The effects of distractors and spatial precues on covert visual search in macaque. Vision Research, 76, pp. 43-9. Vision Res 85:73-9 |
| Khan, Aarlenne Z; Song, Joo-Hyun; McPeek, Robert M (2011) The eye dominates in guiding attention during simultaneous eye and hand movements. J Vis 11:9 |
| Rainville, Stephane J M; Makous, Walter L; Scott-Samuel, Nicholas E (2005) Opponent-motion mechanisms are self-normalizing. Vision Res 45:1115-27 |
| Fiser, Jozsef; Bex, Peter J; Makous, Walter (2003) Contrast conservation in human vision. Vision Res 43:2637-48 |
| Rainville, Stephane J M; Kingdom, Frederick A A (2002) Scale invariance is driven by stimulus density. Vision Res 42:351-67 |
| DeVries, Steven H; Qi, Xiaofeng; Smith, Robert et al. (2002) Electrical coupling between mammalian cones. Curr Biol 12:1900-7 |
| Bex, Peter J; Makous, Walter (2002) Spatial frequency, phase, and the contrast of natural images. J Opt Soc Am A Opt Image Sci Vis 19:1096-106 |
| Rainville, Stephane J M; Scott-Samuel, Nicholas E; Makous, Walter L (2002) The spatial properties of opponent-motion normalization. Vision Res 42:1727-38 |
| O'Brien, H L; Tetewsky, S J; Avery, L M et al. (2001) Visual mechanisms of spatial disorientation in Alzheimer's disease. Cereb Cortex 11:1083-92 |
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