82 RECORDS 



SECTION OF ANTHROPOLOGY AND PSYCHOLOGY. 



November 24, 1902. 



Section met at 8:15 P. M., Professor Farrand presiding. 



The minutes of the last meeting of Section were read and 

 approved. 



The following program was then offered : 



J. B. Miner, Time Intervals Bounded by Varied Stimuli, 



J. H. Bair, The General Practice Curve. 



R. T. MacDougall, On the Relation of Reactions to 

 Certain Secondary Stimuli. 



Summary of Papers. 



Mr. J. B. Miner presented the results of some experiments 

 on the perception of time interv^als bounded by varied stimuli- 

 Intervals of one, two, three, four and six seconds bounded by 

 sounds, lights, or one sound and one light, were given the sub- 

 ject, who then endeavored to reproduce the interval by taps on 

 a telegraph key. For interv^als bounded by sounds, the repro- 

 duced interval changed from plus to minus at a point between 

 intervals of two and three seconds. There is very little differ- 

 ence between intervals bounded by sounds and those bounded 

 by lights ; but a considerable difference is given when the inter- 

 val is bounded by a sound followed by a light or 7>icc versa. 

 The same interval bounded by varied stimuH seemed to the 

 subjects to be longer than where bounded by like stimuli. 

 Memory of intervals bounded by varied stimuli required more 

 effort. Mr. Miner believed that this represented the difference 

 in difficulty of muscular adjustment on which the memory of 

 the time interval depended. The increase in variability with 

 the longer intervals followed the law suggested by Cattell and 

 Fullerton, rather than \\'eber's law. 



The paper by Mr. Bair, on the general practice curve, was 

 read in his absence by Mr. Miner. This paper was based on 

 experiments made with a pack of 48 cards (six different pictures 

 and eight of each picture). The cards wlicn dealt in the same 



