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Jacob Nachmias, Ph.D.
Professor Emeritus, Dept of Psychology
3815 Walnut Street/6196
(215) 898-7523 FAX: (215) 898-7301
email: nachmias@cattell.psych.upenn.edu
Click here for selected publications since Dr. Nachmias' arrival at Penn
RESEARCH INTERESTS
All aspects of visual perception, particularly spatial and temporal interactions
RESEARCH TECHNIQUES
PsychophysicsRESEARCH SUMMARY
Although I am interested in a wide range of topics in visual and auditory perception,my research right now centers on spatial and temporal interactions in human vision. Recent electrophysiological and psychophysical evidence strongly suggests that the human visual system is organized into numerous neural "channels", each selectively sensitive to some local feature of the retinal image, such as orientation and size (or spatial frequency). I conduct psychophysical experiments aimed at (a) defining more precisely the stimulus specificity of these channels, and (b) exploring further the role of such channels in the threshold and supra-threshold perception of various visual patterns. Of late, I have been trying to understand the cues used by observers to discriminate between spatial patterns. This work is closely related to some topics in hearing (namely, profile analysis and comodulation masking release) and in visual neuroscience (response normalization of neurones in primary visual cortex).
KEY WORDS:
Visual psychophysics; spatial vision
