The mysteries of the diagonal: gender-related perceptual asymmetries

In this article, we report a perceptual asymmetry for the two diagonals that is related to gender in that females prefer the diagonal spanning from top right to bottom left (/) whereas males prefer the opposite (). This relationship is observed in a variety of tasks, including aesthetic judgment of paintings, spotting differences between two paintings, and visual search for a tilted line among similarly tilted distractors. This article does not provide an explanation of the relationship between this asymmetry and gender but rules out several potential mediating factors, such as eye dominance, head tilt, handedness, and hemispheric differences. At the same time, the scope of the phenomenon is outlined: The asymmetry is found for both meaningful and meaningless stimuli and in both brief and extended presentations. Moreover, the asymmetry is found to be related to the tilt of the visual elements that require processing, not to their location in the visual field.