Öznel zaman algısının bağlamsal modülasyonu: Hareket eşevreliliği, biyolojik hareket hızı ve sayıların zaman algısı üzerindeki etkisi

This thesis investigates how perception of time is affected by systematic manipulations of stimulus properties, with the overarching aim of contributing to the understanding of (non-temporal) contextual modulation of time perception. Chapter I aimed to investigate the effect of signal-to-noise (SNR) ratio in the motion direction on subjective time. Our results showed constriction of perceived time with increasing (from encoding to testing) SNR with no apparent effects of decreasing SNR. Chapter II aimed to investigate the effect of quantitative and qualitative features of biological motion on subjective time. The speed of biological motion lengthened perceived time whereas qualitative differences in the form of direction of walking did not have an effect on subjective time. Chapter III aimed to investigate how numerosity and stimulus size interact in terms of their effects on subjective time. Two properties of timing stimuli (i.e. numerical value and size) were manipulated simultaneously, both of which have previously been shown to have isolated directional effects on perceived time when they were the sole sources of experimental manipulation. Our results showed that numerals as symbolic representations of numerosities had an effect on subjective time and overshadowed the effect of stimulus size. Overall, results show that subjective time is amenable to a series of stimulus manipulations including motion coherence, motion speed, and numerical magnitude providing an empirical basis for the elaboration of timing models to accommodate interactions with other stimulus features.