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Fig. 7 | Attention, Perception, & Psychophysics

Fig. 7

From: Feature integration theory in non-humans: Spotlight on the archerfish

Fig. 7

Histogram of the reaction-time slopes. To build a histogram of the reaction-time slopes we first calculated the slopes for each human and archerfish subject per task. To do so, we calculated the median (as well as the 25th and 75th percentiles) for each distractor (upper row). Then we fit the medians to a linear line by linear regression (dashed black line) to find the slope. To verify the subject understood the task, we also calculated the target-selection rate (mean and 95% confidence interval, lower line). (A) Color experiment (Experiment 1A). (B) Conjunction of small-and-blue experiment (Experiment 3B). (C) After calculating all slopes for each species, we built the slope histogram for each species. This resulted in two distinct groups of experiments for the fish. Blue indicates reaction-time slopes obtained from the color, size, orientation, motion, and conjunction of large-and-blue experiments. Red indicates reaction-time slopes obtained from the shape and conjunction of small-and-blue experiments. The black dashed line serves a threshold divider between the two groups obtained naturally by Otsu's method and k-means (k=2). (D) For humans the histogram resulted in a continuum. Red indicates reaction-time slopes obtained from the conjunction of the small-and-blue experiment and blue indicates all the other slopes. The black dashed line served as a threshold divider between parallel and serial search modes, as also found in the literature (Wolfe, 1998a)

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