Fig. 1: Experimental task & behavioral performance.
From: Rhythmic sampling of multiple decision alternatives in the human brain
a Trial structure of the three-alternative decision-making task with variable task framing. Stimulus size, contrast and eccentricity are indicative and have been changed for visualization purposes. Participants were asked to select the stimulus that had the highest (framing high: ‘Hig’) or the lowest (framing low: ‘Low’) contrast. b Schematic of the ten unique Gabor grating contrast conditions. For each trial, the three eccentric stimuli (red squares per row) were randomly drawn without replacement from a set of five distinct contrast levels (columns, from low to high contrast). Depending on the trial framing, the lowest contrast grating constitutes a low decision value (framing high) or a high decision value (framing low). c Choice probability across the three alternatives (H, M, L indicates high, medium, low decision value) for all trials and within each framing condition. The dots indicate individual participant’s (nparticipant = 20) choice probability.
