File:Psychological monographs- general and applied (1895) (14577574917).jpg

Identifier: psychologicalmon16amer (find matches)
Title: Psychological monographs: general and applied
Year: 1895 (1890s)
Authors: American Psychological Association
Subjects: Psychology
Publisher: Washington (etc.) American Psychological Association (etc.)
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto

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st of the daily series of ten trials. This trial is least effectedby fatigue and shows therefore the greatest influence of prac-tice. Here there is a gradual rise for the right hand until nextto the last day, while the curve for the left hand begins to dropwhere it should according to our analysis. In general we may therefore say that fatigue appears in bothhands early in the series. The curve for the left hand dropsfar below the record of the first few days. The curve for theright hand shows less drop due to the greater influence of prac-tice, so that the two curves tend to approach one another. Tactual Space Threshold A pair of dividers with wooden tips were used as an aesthesio-meter. The threshold was found on the volar side of the fore-arm, about four inches from the elbow. The points were appliedon either side of a red ink dot which was made on the arm onthe first day and renewed when necessary. The method of mini-mal change with ascending and descending series, was employed. I?
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»fc .0^ il *5 2« 5-^ ^M * ^* c 5 *•*,* £ *^ N ;x; «0r > •1 jv. y /■ / v v, \ / \ / 5-45 / \ *>> / ** ^ *> \ ^ -^ ^*. .S. N \ ^ / / S s H \ V, ? / N Sso s / * s \ 4> \ ^ s **Ni i -*-- ^ ^> -< 4* ^ ^ ^ * 5 Is PSYCHOPHYSIOLOGY OF A FAST 15 Five trials excluding one-point vexier trials were made at eachdistance. Four correct out of five was considered the threshold.13For the first few days the curve (XI) keeps the high level of7 cm. On the seventh day there is a drop to 5.5 cm., then aslight rise to a level of 6 cm. and a high threshold of 6.5 cm.on the 14th day followed by a fall to the minimum of 5 cm. onthe 22nd day, which minimum is again reached on the 26th and30th days. The final days show a rise to 6cm. The decideddrop on the seventh day may be due to adaptation to the experi-ment, which in this instance means the adoption of a definiteand clear criterion of discrimination. The drop in the middle ofthe series after a more or less constant

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