Fig. 3.

Example of threshold computation for (a) a block of global-property classification (concealment) and (b) a block of basic-level categorization (ocean). Each graph shows data from the same participant. The top row shows accuracy as a function of presentation duration. The curves are Weibull fits, and thresholds for 75%-correct performance are indicated. The bottom row shows histograms of presentation times; the mode in each distribution was another measure of the threshold. The thresholds reported in Table 2 are the averages of the estimates obtained using the two methods.