This study investigated how properties of precedent stimuli affect the perceived temporal duration for the following stimuli by the use of an experimental methodology similar to a previous study’s, which found cue recruitment in depth perception (Backus & Haijiang, 2007). Participants viewed movies (Experiment 1) or static images (Experiment 2), which lasted for various durations. Each participant conducted 250 training trials and 250 test trials in alternation. In the training trials, duration of the movies or static images was consistent with retinal location. In the test trials, participants judged whether the duration of the stimuli, which were presented at one of the alternative locations in random order, corresponds to the short or long criteria. Results of two experiments showed no sign of cue recruitment based on Bayesian rule concerning with the stimulus location, while perceived duration was modulated by the duration of the immediately precedent stimulus in a contrasting manner.

Is color vision deficiency a handicap to coloring? To approach this question, we experimentally examined colors used by individuals with color vision deficiency in coloring tasks. We converted 25 referring object images to line drawing images, and created the experimental program for coloring tasks. Participants colored each area of the line drawing stimuli to obtain the same color while referring to the image. The results revealed that the participants with color vision deficiency selected colors similar to those of normal vision for more images than expected, whereas they used different colors for images with long wavelength colors or low saturation.