A Study of the Relation of Accuracy to Speed (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...results, may be due to the fact that (1) Martin and Midler's weights were much heavier than the weights used in this experiment, ranging from 416-3,221 gms. and (2) that fatigue and actual muscular effort were absent or negligible among my observers. In general, I believe that the subjects in this experiment may best be classified as (1) impulsive, best at the faster rates, (2) cautious, --best at the slower rates, and (3) indifferent. CONCLUSIONS The following conclusions are drawn from this experiment: 1.--There is a real change in the accuracy of discrimination for Lifted Weights as the rate changes from a 4" lift for each weight, with a 4" interval between weight pairs, to a 1" lift for each weight, with a 1" interval between weight pairs. The Optimal Rate is close to 2" for each weight with a 2" interval between weight pairs. 2.--The time-interval (ostensibly given for judgment) is of little or no influence on the accuracy of discrimination, unless it is very long or very short: under both of which conditions it makes for inaccuracy. 3.--The 75%' threshold is lowest at Rate 3. 4.--The tendency to overestimate the second weight increases regularly with increase in lifting rate. 5.--Confidence in the accuracy of judgment varies directly with accuracy of discrimination, but does not change much with increase in lifting rate. Different observers are, in general, quick, cautious, or intermediate in giving their decisions. "Op. cit. p. 29ff. 2. Speed and Accuracy in Judging the Comparative Length of Lines. PROBLEM In this experiment an attempt was made to find what effect the time given for perception has on the accuracy with which lines of variable length can be judged longer or shorter than a given...