September 2023
Volume 23, Issue 11
Open Access
Optica Fall Vision Meeting Abstract  |   September 2023
Poster Session: A unifying framework for perceptual decision-making
Author Affiliations
  • Ying Lin
    University of Rochester
  • Zhen Chen
    University of Rochester
  • Jose Reynoso
    The City College of New York
  • Ralf Haefner
    University of Rochester
  • Duje Tadin
    University of Rochester
Journal of Vision September 2023, Vol.23, 59. doi:
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      Ying Lin, Zhen Chen, Jose Reynoso, Ralf Haefner, Duje Tadin; Poster Session: A unifying framework for perceptual decision-making. Journal of Vision 2023;23(11):59.

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      © ARVO (1962-2015); The Authors (2016-present)

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Perceptual decision making (PDM) has been studied using two approaches. Threshold measurement is predominant used in psychophysics, while reaction times (RT) with associated models have been used to estimate components of PDM (i.e., drift rate). To test if these two approaches reflect overlapping mechanisms, we conducted 3 experiments: a motion, a static orientation, and a dynamic orientation task. DT is the shortest stimulus presentation time sufficient to make accurate perceptual decisions. RTs and choices were fitted by a drift diffusion model (DDM). We expected a close relationship between DTs and drift rates, allowing us to accurately predict DTs from RT. In the motion task, we found a close relation between the empirical DTs and the DTs predicted by the DDM. Surprisingly, in the static task, there was little correlation between the two; DTs, improved monotonically with higher contrast, but drift rates saturated at 6%. We hypothesize that this mismatch is due to the information being available immediately in the static task, without needing to accumulate new evidence. Thus, we developed a novel dynamic orientation task that mimics the dynamic nature of the motion task and found a similar relation between DTs and drift rates. In summary, we show a close link between DTs and drift rate for the two dynamic tasks. This result supports the conceptualization of drift rate as a proxy for perceptual sensitivity but only for task where new information becomes available over time.

 Funding: Funding: None

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