... coding. Coding by place is when different values on a stimulus dimension are represented by which set of neurones is active. Different neurones may correspond to different spatial frequencies. Frequency coding is when different values on a sensory dimension may be represented by the frequency of nerve impulses in a single nerve. Bekesy (1929; as cited in Mollon, 1974) argued stimulus coded by place would show a distance paradox; that is the maximum after effect will be for stimulus some distance along the direction from the adapting stimulus. If an after effect shows distance paradox then that sensory dimension is probably coded by place. If it is coded by frequency then adaptation at any part will reduce sensitivity at all points along the dimension (Mollon, 1974). Different areas of the visual cortex are specialised for the processing of orientation (V1) and motion (MT). Hubel and Wiesel (1962) found that the ...

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