A substantial amount of evidence established the existence of two main streams of visual information processing in the brain. According to the two-stream model, perception of objects depends on the ventral stream, incorporating the inferior temporal and the fusiform gyri, whereas identification of spatial location is subserved by the dorsal stream anchored by the superior parietal lobule. Neuroimaging investigations of age differences in visual perception support the double dissociation of ventral and dorsal streams in both younger and older subjects. However, several important age differences have been observed. When confronted with a relatively simple perceptual task, older subjects evidenced increases in rCBF to the amodal and visual association areas, whereas their younger counterparts showed greater activation of the primary and secondary visual cortices.

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