Speaker

Jay Holden

Title

"Variability in Response Time"

Abstract

Systematic patterns of variability in response time are a key focus of cognitive psychology. I use methods derived from fractal geometry to characterize patterns of variability in standard cognitive tasks. Key findings are: (1) a mix of pink noise and white noise in on-line, trial to trial measures of response time, and (2), a nonlinear stretching in the tails of response time density functions that is consistent with multiplicative interactions that give rise to lognormal distributions.