Population effects are also evident in single subjects.

<p>Data points indicate per subject fit coefficients <i>c</i>₅₀ (A) and <i>d</i>′_<i>max</i> (B), corresponding to coherence level at half maximum performance and asymptotic performance, respectively. For each subject, two Naka-Rushton equations per cue type were fit to the psychophysical data, revealing four informative coefficients. A decrease in <i>c</i>₅₀ between validly and invalidly cued trials indicates a contrast gain effect and an increase in <i>d</i>′_<i>max</i> a response gain effect. Dashed lines connect data points originating from the same subjects.