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. 2009 Jan 5;106(5):1666–1671. doi: 10.1073/pnas.0810496106

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© 2009 by The National Academy of Sciences of the USA

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Fig. 2. — Results of the opposition, duration, and ISI experiments. (A) Results of the opposition experiment. A positive validity effect is obtained in the 25-Hz condition, whereas the validity effect is negative in the 50-Hz condition. (B) RTs for congruent and incongruent trials as a function of (50 Hz) flicker preview duration. The congruency effect develops only after at least 200-ms flicker duration. (C) RTs for congruent and incongruent trials with a constant-flicker preview duration (1,000 ms) but varying change-target onsets (ISI) after flicker preview offset. Although there is still a congruency effect 50 ms after flicker offset, the effect vanishes within 250 ms and produces an “inhibition of return” effect (24) after 500 ms.