Fig. 1.

A. Cartoon of the visual system showing that separate magnocellular (M) and parvocellular (P) pathways project differentially to dorsal vs. ventral visual streams. Properties of the pathways are indicated in the table.

B. Flattened map of visual cortex showing primary (V1) and secondary (V2–V4) visual regions (legend shown at bottom). Regions showing preferential response to low, medium and high spatial frequency stimulation are shown in red, yellow and blue, respectively. Schizophrenia patients show significant reductions in response to low spatial frequency stimuli (red areas), whereas response to high spatial frequency stimulation (blue regions) remains relatively intact. From Martinez et al. (2008).