| Paper: | PS-2B.68 | ||
| Session: | Poster Session 2B | ||
| Location: | H Fläche 1.OG | ||
| Session Time: | Sunday, September 15, 17:15 - 20:15 | ||
| Presentation Time: | Sunday, September 15, 17:15 - 20:15 | ||
| Presentation: | Poster | ||
| Publication: | 2019 Conference on Cognitive Computational Neuroscience, 13-16 September 2019, Berlin, Germany | ||
| Paper Title: | Choice History Biases Depend on Environmental Stability and State Uncertainty | ||
| Manuscript: | Click here to view manuscript | ||
| License: |  This work is licensed under a Creative Commons Attribution 3.0 Unported License. |
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| DOI: | https://doi.org/10.32470/CCN.2019.1237-0 | ||
| Authors: | Anke Braun, University Medical Center Hamburg-Eppendorf, Germany; Anne E Urai, Cold Spring Harbor, United States; Tobias Donner, University Medical Center Hamburg-Eppendorf, Germany | ||
| Abstract: | Perceptual decisions under uncertainty are often biased by the history of preceding events. For example, ob- servers tend to repeat (or alternate) their judgments of the sensory environment more often than expected by chance (Braun, Urai, & Donner, 2018; Frund, Wichmann, & Macke, 2014). We test the idea that such choice history biases arise from the context-dependent accumulation of internal decision signals across trials (Glaze, Kable, & Gold, 2015). Observers performed a standard visual ran- dom dot motion discrimination task near psychophysical threshold in several different environments. Those were made up of different levels of auto-correlation between the stimulus categories in successive trials (Repetitive, Random, or Alternating), and the absence or presence of single-trial outcome feedback. Participants adjusted both the strength and the sign of their history biases to the environment. When no feedback was available this ad- justment was driven by previous choices modulated by confidence. When feedback was provided the adjustment was predominantly based on previous stimuli. | ||