Researcher:
Çoşkun, Filiz

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Master Student

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Filiz

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Çoşkun

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Çoşkun, Filiz

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20152

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Researcher Of Publications: search.filters.isAuthorOfPublication.c3e9b350-9e1d-422f-889d-e0442639d8b8

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    Sequential temporal discrimination in humans and mice
    (The Regents of the University of California, 2015) Department of Psychology; N/A; Department of Psychology; N/A; Balcı, Fuat; Berkay, Dilara; Sayalı, Zeynep Ceyda; Çoşkun, Filiz; Faculty Member; Master Student; Undergraduate Student; Master Student; Department of Psychology; College of Social Sciences and Humanities; Graduate School of Social Sciences and Humanities; College of Social Sciences and Humanities; Graduate School of Social Sciences and Humanities; 51269; N/A; N/A; N/A
    Previous studies showed that humans and mice can maximize their rewards in two alternative temporal discrimination tasks by incorporating exogenous probabilities and endogenous timing uncertainty into their decisions. The current study investigated whether the probabilistic relations modulated the temporal discrimination performance in scenarios with more than two temporal options. In order to address this question, we tested humans (Experiment 1) and mice (Experiment 2) in the dual-switch task, which required subjects to discriminate three time intervals (short, medium, and long durations) in a sequential fashion. The latencies of switches from short to medium and from medium to long option were the main units of analysis. The results revealed that the timing of switches between the first two options (short-to-medium) were sensitive to probabilistic information in both humans and mice. Mice but not humans adapted the timing of their subsequent switches between the last two options (medium-to-long) based on the probabilistic information associated with these latter options. These results point at a suboptimal tendency in the temporal decisions of humans with multiple options.
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    PublicationOpen Access
    Optimal time discrimination
    (Sage, 2015) Department of Psychology; Çoşkun, Filiz; Sayalı, Zeynep Ceyda; Gürbüz, Emine; Balcı, Fuat; Undergraduate Student; Faculty Member; Department of Psychology; College of Social Sciences and Humanities; N/A; N/A; N/A; 51269
    In the temporal bisection task, participants categorize experienced stimulus durations as short or long based on their similarity to previously acquired reference durations. Reward maximization in this task requires integrating endogenous timing uncertainty as well as exogenous probabilities of the reference durations into temporal judgements. We tested human participants on the temporal bisection task with different short and long reference duration probabilities (exogenous probability) in two separate test sessions. Incorrect categorizations were not penalized in Experiment 1 but were penalized in Experiment 2, leading to different levels of stringency in the reward functions that participants tried to maximize. We evaluated the judgements within the framework of optimality. Our participants adapted their choice behaviour in a nearly optimal fashion and earned nearly the maximum possible expected gain they could attain given their level of endogenous timing uncertainty and exogenous probabilities in both experiments. These results point to the optimality of human temporal risk assessment in the temporal bisection task. The long categorization response times (RTs) were overall faster than short categorization RTs, and short but not long categorization RTs were modulated by reference duration probability manipulations. These observations suggested an asymmetry between short and long categorizations in the temporal bisection task.