Discrimination of spatial and temporal intervals defined by three light flashes: Effects of spacing on temporal judgments and of timing on spatial judgments

Observers were presented stimulus patterns consisting of a sequence of three laterally displaced light flashes, which defined two spatial intervals and two temporal intervals. The position and time of the second flash were varied factorially, and observers were asked to make relative judgments of either the two spatial intervals or the two temporal intervals. “Induction” effects of stimulus timing on spatial judgments and of stimulus spacing on temporal judgments were both found; however, the directionality of these effects differed between subjects. The results are inconsistent with the hypothesis, derived from previous findings, that such effects are determined primarily by a tendency toward perceiving constant velocity of apparent motion; it is proposed that the directionality of the induction effects is determined largely by the strategy adopted by the observer for combining spatial and temporal stimulus information.     

QMLE: Fast,robust, and efficient estimation of distribution functions based on quantiles

Quantile maximum likelihood (QML) is an estimation technique, proposed by Heathcote, Brown, and Mewhort (2002), that provides robust and efficient estimates of distribution parameters, typically for response time data, in sample sizes as small as 40 observations. In view of the computational difficulty inherent in implementing QML, we provide open-source Fortran 90 code that calculates QML estimates for parameters of the ex-Gaussian distribution, as well as standard maximum likelihood estimates. We show that parameter estimates from QML are asymptotically unbiased and normally distributed. Our software provides asymptotically correct standard error and parameter intercorrelation estimates, as well as producing the outputs required for constructing quantile—quantile plots. The code is parallelizable and can easily be modified to estimate parameters from other distributions. Compiled binaries, as well as the source code, example analysis files, and a detailed manual, are available for free on the Internet.     

STUDIES IN VISUAL PERCEPTION OF ARCHITECTURAL SPACES AND ROOMS: II. Judgments of open and closed space by category rating and magnitude estimation

G ärling , T. Studies in visual perception of architectural spaces and rooms. II. Judgments of open and closed space by category rating and magnitude estimation. Scand. J. Psychol ., 1969, 10 , 257–268.—In one experiment, colour photographs of architectural spaces were employed as stimuli and judged with respect to open and closed space. Category scales of open and closed were complementary, magnitude scales were reciprocal. Judged open space correlated positively and judged closed space negatively with physical size of actual spaces. In another experiment, judged size was found to be directly related to judged open space and inversely related to judged closed space. Furthermore, open and closed space judged in situ correlated to a significant degree with corresponding judgments from photographs.     

When stereotype‐based expectancies impair performance: the effect of prejudice,race, and target quality on judgments and perceiver performance

High‐ and low‐prejudiced participants were presented with a lecture segment in which the race of the professor (White or Black) and lecture quality (high or low) were manipulated. Consistent with predictions, low‐prejudiced participants were more extreme in their evaluations (more negative) and performed more poorly on test items when presented with an expectancy‐violating low‐quality Black lecturer. High‐prejudiced participants were more extreme in their evaluations (more positive) and performed more poorly when presented with an expectancy‐violating high‐quality Black lecturer. Copyright © 1999 John Wiley & Sons, Ltd.     

Animal cognition + optimal choice = behavior: A review of adaptive behavior and learning, 2nd Ed., by J. E. R. Staddon

Staddon discusses a vast array of topics in comparative psychology in this book. His view is that adaptive behavior in most cases is the result of optimal choice acting on an animal's knowledge about the world. Staddon refers to this as a functional teleonomic approach inasmuch as it attempts to understand an animal's behavior in terms of goals. He builds mathematical models based on this idea that are designed to reproduce specific sets of empirical observations, usually qualitatively. A natural consequence of Staddon's approach is that many models are developed, each of which applies to a specific set of observations. An alternative to functional teleonomy is a functional approach that builds on prior principles. In most cases, this approach favors a single‐theory account of behavior. Prior principles can be understood as functional stand‐ins for antecedent material causes, which means that these accounts are closer to mechanistic theories than are goal‐based teleonomic accounts. An ontological perspective, referred to as supervenient realism, is a means of understanding the relationship between functional theories and the material world. According to this perspective, the algorithmic operation of a successful functional theory may be understood to supervene on the material operation of the nervous system.