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Publisher Summary This chapter, through a series of experiments, discusses the existence of functional specialization in the visual cortex of the normal human. Each experiment involved six sequential measurements of regional cerebral blood flow (rCBF) during the presentation of three different visual stimuli in balanced order (ABCCBA) to remove time and habituation effects. Displays were generated on a computer monitor at a viewing distance of about 40 cm and occupying the central 40° of the field of view. The Mondrian used was a collage of fifteen squares and rectangles of different shapes and colors, assembled to form an abstract scene with no recognisable objects, thus, minimizing the role of memory and learning. No area of the Mondrian was surrounded by another area of only single color, thus, eliminating any effects that might be attributable to induced colors or to color contrasts. For the motion experiment, two versions of a black and white random square pattern were used in which an array of approximately 500 small, black squares, each subtending 1° were displayed on a white background. |
