Time perception and endogenous spatial attention: Differential effects of shifts towards vs. away from stimuli
Mon—HZ_13—Talks2—1605
Presented by: Alina Krug
Previous research has shown that increasing eccentricity shortens the perceived duration of brief stimuli. However, shifts of endogenous spatial attention can prolong perceived duration. Aim of the present study is to investigate whether endogenous attention prolongs perceived duration for stimuli present at different eccentricities. In a temporal bisection task, participants judged whether a peripheral probe with varying duration (20-220 ms) presented at 3 or 9 degrees of visual angle (dva) is more similar to a short or long previously learned anchor stimulus. In Experiment 1, the probe was preceded by a valid (100%) or neutral central arrow cue. In Experiment 2, the probe was preceded by a valid or invalid central arrow cue; cue validity was set to 75%. An eye-tracker monitored saccadic eye movements on-line. Replicating previous research, perceived duration was shorter for stimuli presented at 9 compared to 3 dva in both experiments. However, there was no effect of cue on perceived duration in Experiment 1. In Experiment 2, perceived duration was shorter for the invalid compared to the valid cue, yet there was no interaction between eccentricity and cue. This indicates that shifting attention away from the peripheral probe shortened perceived duration rather than shifting attention towards it prolonging it. The results are discussed with regard to attentional disengagement and reorienting as well as differential temporal processing mechanisms and potential underlying neurophysiological mechanisms.
Keywords: Time perception, Duration estimation, Peripheral vision, Eccentricity, Visual spatial attention, Endogenous attention, Endogenous cueing