Figure 10.3Temporospectral maps of amplitude variations of potentials recorded from the right primary audi-
tory cortex (leads 2, 3, and 6). Time, related in abscissae, is reduced to 175 ms, full scale. On the ordinate axis, each
yellow dotrepresents the frequency. Amplitude is represented by colour. A cubic spline interpolation is used in
order to obtain a continuous potential line between the different frequencies. Each spatial /reconstruction gives a
continuous map both in time and in frequency.Dark coloursare values close to the neutral potential, and bright
coloursare used for the activity—bluerepresents negativity and redrepresents positivity. The white arrowindicates
the beginning of the sound. (For comments see text.) (See Plate 1 in colour section.)
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