Presentation Information
[P1-17]Investigating the Modulation of Prior Formation in a Multisensory 2AFC Temporal Judgment Task
*Natsuki Ueda1, Mitsunari Abe1 (1. National Center of Neurology and Psychiatry (Japan))
Keywords:
Prediction,Sensorimotor organization,Multi modal integration
The human brain integrates uncertain sensory inputs with prior expectations to enable efficient interaction with the environment. Previous studies showed that, in a temporal reproduction task, a single prior tends to be formed across different sensory modalities, while distinct priors emerge when stimuli are associated with different motor responses. This suggests that the structure of prior formation may depend more on motor output than on sensory modality. This study aims to investigate whether similar principles apply to perceptual decision tasks using a two-alternative forced choice (2AFC) paradigm. Participants will judge which of two sequentially presented stimuli is longer in duration. We will manipulate sensory modality (vision vs. audition) and response mode (button press vs. vocal response), along with the statistical distribution of stimulus durations (short-centered vs. long-centered), to examine how priors are formed and generalized across conditions. This research will clarify whether prior representations in temporal perception are structured based on sensory input, motor output, or both. By using a perceptual comparison task with minimal motor demands, this study provides novel insights into the sensorimotor organization of prediction.