Luminance-Dependent Latency as Measured by the Hess Effect
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J. M. Williams Luminance and the Hess Effect 1 Luminance-Dependent Latency as Measured by the Hess Effect by John Michael Williams Copyright (c) 1980, 2011, John Michael Williams ([email protected], as of 2013-02-07) Permission is granted to reproduce one PDF copy and one hard copy of this document, including the Preface, for personal and private, noncommercial use. All other rights are reserved. Preface to the PDF Online Version The original 1980 doctoral dissertation manuscript was typed double-spaced in hardcopy on a typewriter. The result was copied by Southern Illinois University and bound in letter-size, single-sided paper. Parts of it were rewritten and published in the journal, Vision Research, in 1983, in an article coauthored with Professor Alfred Lit, the author's doctoral dissertation advisor: Williams, J. M., & Lit, A. (1983) "Luminance-dependent visual latency for the Hess effect, the Pulfrich effect, and simple reaction time". Vision Research, 23, 171-179. The current, PDF, version was composed by scanning the original manuscript on a UMAX S-12 scanner at 600 dpi to TIFF bitmaps. The result then was converted to Open Office Writer v. 3.2 format. Pages which were predominantly text were converted using the Tesseract OCR program. Nontext (usually graphical) pages were imported as bitmap figures. The Writer document then was rectified by hand; this entailed considerable manual editting, especially for formulas, tables, equations, and references. Page layout was modified slightly in this process, although pagination generally was preserved. Figures were combined with figure captions, although these were on separate pages in the dissertation hardcopy manuscript. Formulas sometimes were reformatted to fit on one line. A few minor errors, mostly of the typo variety, have been corrected, and a couple of minor additions were made in the introductory matter. Words originally typed underlined for emphasis generally were put in italics, often bolded. The 2011-01-01 version corrects a few newly-found typoes and improves the formatting of some equations. The original dissertation ms is available from University Microfilms, Ann Arbor, Michigan (Abstract #8213538, 1980). A web site dedicated to the Pulfrich, Hess, and related effects, with explanations, literature, and animations, is maintained by the author at www.siu.edu/~pulfrich.
Luminance-Dependent Latency as Measured by the Hess Effect
Carl von Hess is credited with an illusion in which dimmer moving objects appear to lag brighter ones. Diffusion in the human retina explains Hess and Pulfrich illusions, and visual reaction time.Reviews data and theories of visual latency, and related visual performance parameters.
