Abstract
We investigated the relationship between evoked local cerebral blood flow (LCBF) and the field potential induced by somatosensory activation. The specific aim of the present study was to examine the correlation between variations of evoked LCBF and field potential when the stimulus duration was changed, and the dependency of the correlation on stimulus frequency. Evoked LCBF was measured using laser-Doppler flowmetry and the field potential was observed using a tungsten electrode inserted into the cortex α-chloralose-anesthetized rats. The cortex was activated by electrical stimulation of the hind paw with a 1.5 mA pulse (0.1 ms) applied at frequencies of 0.5, 1, 5 and 10 Hz for durations of 2, 5, 8, 10 or 15 s. We extended our previous finding [Neurosci. Res. 40 (2001) 281–290], that both the magnitude of evoked LCBF (integrated LCBF) and the summed field potential (ΣFP) exhibited a maximum at a stimulus frequency of 5 Hz to five different stimulus durations. Moreover, although variations of integrated LCBF and ΣFP induced by changes in the stimulus duration were linearly correlated, the slope of the regression line depended on the stimulus frequency. This stimulus frequency dependence of the integrated LCBF-ΣFP linear relationship may be because the vessel response is frequency dependent.
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