Judgments of temporal order (method of constant stimuli) were obtained as a function of the delay between the onset of a visual and an auditory stimulus. Simple reaction times were also obtained to both the visual and the auditory stimulus. Differences in reaction time could not be used to predict the stimulus asynchrony for temporal order judgments, because the onset of the auditory stimulus had to precede the onset of the visual stimulus for 50% judgment of “click first,” whereas the auditory reaction time was significantly shorter than the visual reaction time. A speculative explanation is offered to account for the differences between the present findings and those of Hirsh and Sherrick (1961).
1956HELVETICA CHIMICA ACTA ones. -S-shaped equilibrium curves were obtained with divalent metal cations and H+ as reference ion. The strong acid groups are more selective for the divalent cations, the weak ones for H+. Fe9+ is fixed very selectively under acidic conditions, though it is taken up rather slowly. -The selectivity for Ni2+, Zn2+, and Cuz+ with Ca2+ as reference ion increases strongly with increasing saturation of the exchanger with divalent cations, the remaining groups of the exchanger being in the H+-form. Calculations showed much higher selectivity coefficients for the dibasic PO,2-than for the monobasic PO,-groups. Correspondingly a starch phosphate, the weak acid groups of which were partially esterified by diazomethane, was much less selective for divalent metal cations.
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