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The internal clock model for time judgments of short intervals describes adequately the relations among the methods of estimation, production, and reproduction observed under normal conditions. Since general anesthetics affect time productions by slowing of this hypothesized clock, this study investigated whether the relations predicted by the model would hold during inhalation of a general anesthetic-fluroxene. Six 5s estimated, produced, and reproduced 3-40-sec. intervals before and during fluroxene inhalation. The model predicted the results from the majority of 5s, thus supporting the internal clock concept. The anesthetic increased the slope of the production function and accordingly decreased the slope of estimation, leaving the slope of reproduction unchanged, thus maintaining the predicted relations among the methods. An alternative model, viewing time judgments as depending on memory content, could not account for the effects of the anesthetic on time reproductions seen with some 5s.

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