The induced effect refers to a visual phenomenon in which observers perceive a global stereoscopic slant about a vertical axis when the image presented to one eye is vertically magnified with respect to that presented to the other eye. This study proposed a computational model to account for stereoscopic depth perception including the induced effect, and tested this model using numerical simulations. In our model, we assumed that horizontal disparities were determined after correcting the overall size of two retinal images. Our model was able to predict the slant seen in the induced effect. Our simulation results indicate that the visual system corrects global stereo correspondence by using vertical size disparity before determining local horizontal disparities.

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The effects of handedness on cognitive function in middle- and elderly-people were investigated. Some aspects of cognitive functions were examined, for example, cognitive style (VVQ: verbalizer-visualizer questionnaire), spatial cognition (Money road test), and attention (Stroop test and D-CAT). It appeared that there were no differences in the cognitive functions between right- and left- handedness in middle-people (under 65 years old). However, in young-old people (65-74 years old), the influences of left-handedness on cognitive functions were found. These results indicate that the both aging and left-handedness might be influenced on cognitive function. The potential cognitive load in daily life would be discussed.

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