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Discrimination performance (d′) as a function of total processing time (test onset to response) for display sizes of 4 and 12 from Experiment 2 for (upper left) 100 ms display homogeneous searches; (lower right) 100 ms display heterogeneous searches; (upper right) 50 ms display homogeneous searches, and (lower right) 50 ms display heterogeneous searches. The symbols are observed data points and the smooth curves are best fitting descriptive exponential functions.
