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PET activity displayed on the average MR brain where breathing the CO2 mixture in a FM (CO2 FM) is compared with the image of breathing CO2 with a MP (CO2 MP). (a) Activation in central lobule (III) (sagittal section x = −4). (b) Deactivation bilaterally in inferior semilunar (Crus II) (upper arrow) and gracile lobule (VIIB) (lower arrow). The color coding of Z scores is shown in Fig. 2.
