電気ショックのマグニテュード推定
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概要
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Magnitude estimates for single electrical pulses of 2-ms duration were obtained as a function of stimulus current, with the parameters of trial block and current level. For the high-current level, producing pain responses, the magnitude estimates remained constant independent of block. For the low-current level, yielding tactile sensations, the magnitude estimates decreased as a function of block, in particular for lower stimulus current at later blocks. These results suggested that (1) there are two neural mechanisms with different sensory adaptation processes, and (2) the equation ∅=<I>k</I>(∅/∅<SUB>0</SUB>)<SUP>n</SUP>, rather than the equation ∅=<I>k</I>(∅-∅<SUB>0</SUB>)<SUP>n</SUP>, gives a reasonable description of data, because the former equation on log-log coordinates provides a double-limbed function that may correspond to the neural mechanisms.
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