Poster De Conférence Année : 2024

Experimental design and stimulus duration selectively modulate repulsive and attractive history effects

Résumé

The prevalence of attractive (i.e., serial dependence) and repulsive (i.e., adaptation) effects may depend on affordances provided by experimental designs and task types. When subjects need to differentiate a stimulus feature from its predecessors, the visual system may become sensitive to that feature, resulting in repulsed perception. Conversely, when subjects need not differentiate among stimulus features, the visual system may become less sensitive, resulting in attracted perception and leading to erroneous continuity between sequential features. We hypothesized that attractive and repulsive effects could be modulated by asking subjects to respond to each stimulus or the second stimulus in a sequence of two. Moreover, these effects may vary depending on the type and nature of the response. To test these hypotheses, subjects participated in four experiments that varied the experimental design (i.e., trials having either one or two stimuli) and task type (i.e., subjects either freely adjusting a response cue or making a two-alternative forced choice). In each experiment, stimulus durations varied between blocks to test whether stimulus duration modulated attractive and repulsive effects. In all experiments, subjects responded to the orientation of a Gabor patch. Preliminary results show a prevalence of repulsion in both adjustment and forced choice tasks when subjects responded to the second stimulus in trials with two stimuli. Repulsion was absent when the first stimulus duration was shorter than the second. In trials with one stimulus, attraction effects emerged along with repulsion effects. However, it is not yet clear how attraction and repulsion were modulated by stimulus duration and task type in these trials. To better understand the influence of these factors, subjective biases, orientation range, and duration between trials will be investigated in the remaining data collection and analysis.

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Dates et versions

hal-05046993 , version 1 (25-04-2025)

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  • HAL Id : hal-05046993 , version 1

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Mert Can, Thérèse Collins. Experimental design and stimulus duration selectively modulate repulsive and attractive history effects. European Conference on Visual Perception, Aug 2024, Aberdeeen, United Kingdom. ⟨hal-05046993⟩

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