Fig. 5. Three-dimensional representation of the PV-amplitude relation as a function of the SPV, for the fast phases of the OCR obtained in response to velocity step stimuli, for (A) the `resting', (B) `standing' and (C) `flying' conditions. Data were obtained from the six animals. The equations of the multiple linear regressions are indicated for each condition. The PV values were independent from the SPV in the `resting condition', whereas they increased slightly in the `standing condition' and strongly in the `flying condition'.