Maria Pereverzeva : Centering bias in heterochromatic brightness matching

Abstract

A bias is a systematic dependence of psychophysical judgment on parameters extraneous to the nature of a stimulus, i.e. stimulus range, response range, decision criteria etc. Biases can pose a serious problem in psychophysical judgments: when we think we are measuring an observer’s response to the stimuli, we may be, in fact, looking at the response already contaminated by effects of the stimulus range. I will describe our work on centering bias in heterochromatic brightness matching. I will show concrete examples of centering bias, and discuss possible bias mechanisms..