. Handbook of mental examination methods. iece of the same weight and with the same bending pres-sure, and for this reason, in accurate work, the results obtainedmust be considered as having been obtained with different piecesof apparatus. For this reason I have used a camel hair brush,from which most of the outside hairs have been clipped, leavinga brush containing about 125 hairs, 18 mm. long, and having abending strength of from 100 to 200 mg. This instrument ismuch more constant than the cotton wool and may be utilized forthe testing of many patients. The method of using the brush isthe sa
. Handbook of mental examination methods. iece of the same weight and with the same bending pres-sure, and for this reason, in accurate work, the results obtainedmust be considered as having been obtained with different piecesof apparatus. For this reason I have used a camel hair brush,from which most of the outside hairs have been clipped, leavinga brush containing about 125 hairs, 18 mm. long, and having abending strength of from 100 to 200 mg. This instrument ismuch more constant than the cotton wool and may be utilized forthe testing of many patients. The method of using the brush isthe same as that for the cotton wool. (&) Touch Threshold.—For more exact tests I have employedthe touch instrument of Block, which is illustrated in Fig. piece of fine piano wire, A, is bent at a right angle and one end 28 MENTAL EXAMINATION METHODS is soldered to a small screw, C. The length of the longer armof the wire is 15 cm., and of the shorter, B, 5 cm. The area ofcross section is sq. mm. The screw is screwed into a piece. Fig. 6. Block esthesiometer. A-B, spring wire stimulant; D, supporting pin; E, scale. of wood, F, of the form indicated in the figure. A pin, D, isinserted to keep the wire from vibrating. The larger end of thewood holds a scale, E, divided into degrees, and the instrumentis calibrated in terms of these. The instrument permits the giv-ing of stimuli with pressures varying from 0 to 2,000 mg. The end of the shorter piece of wire is pressed against thepatients skin and the pressure increased until he reports that heperceives a touch. Care must be taken to keep the wire, F,as nearly vertical as possible. The scale is read and the figurerecorded. With this instrument the relative thresholds in differ-ent parts of the body may be determined and a quantitative esti-mate made of hyperesthesia as well as hypesthesia and anesthesia. Similar tests may be made with the von Frey hairs, but thenumber of these necessary for the testing of any part increasesthe
Size: 2031px × 1230px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade19, booksubjectpsychologypathological
