Fig. 2: Task and presented probabilistic structures.
a Schematic of ‘set’ - ‘go’ task. In auditory, visual, and somatosensory blocks of ‘set’ - ‘go’ trials, subjects were asked to respond as fast as possible to the ‘go’ cue by pressing a button with their right index finger. In 9.09% of trials, no ‘go’ cue was presented (catch trials) in which case subjects were asked not to respond. The time between ‘set’ and ‘go’ (the ‘go’ time) varied systematically. Within a block of trials the ‘go’ time was drawn from either a truncated exponential distribution (PDExp) or its left-right flipped counterpart (PDFlip). b The two presented event PDFs, PDExp and PDFlip, in their original, temporally, and probabilistically blurred versions (see Methods). c The hazard rates (HR) of PDFExp and PDFFlip in their original, temporally, and probabilistically blurred versions (see Methods). (“Press Button Halfway Icon” created by H Alberto Gongora via the Noun Project (thenounproject.com/term/press-button-halfway/637743) licensed as Creative Commons CCBY).
