Manual of mental and physical tests : a book of directions compiled with special reference to the experimental study of school children in the laboratory or classroom . be allowed to give the answersame, if he naturally does so when he is unable to say higher orlower. Ss who are extremely unfamiliar with tones occasionally do not under-stand what is meant by higher and lower, and, like markedly unmusicalor tonally-deaf $s, are apt to search for differences in intensity or dura-tion of the tones instead of for qualitative (pitch) differences. In suchan event, E must select two forks that give t
Manual of mental and physical tests : a book of directions compiled with special reference to the experimental study of school children in the laboratory or classroom . be allowed to give the answersame, if he naturally does so when he is unable to say higher orlower. Ss who are extremely unfamiliar with tones occasionally do not under-stand what is meant by higher and lower, and, like markedly unmusicalor tonally-deaf $s, are apt to search for differences in intensity or dura-tion of the tones instead of for qualitative (pitch) differences. In suchan event, E must select two forks that give the maximal difference, andgive S a short course of training by striking the forks in succession, andexplaining after each pair that the second was higher or lower, as thecase may be. If this training is futile, &s discrimination must be ex-tremely poor, and he may be ranked 30-j- TEST 19 : DISCRIMINATION OF PITCH 215 Insert firmly in the oak pedestal, with their axes at rightangles to the main axis of the resonance box, two forks thatafford a large stimulus difference, , the standard and thehighest fork (marked 30). Damp one fork, e. g., the nearer one,. FIG. 52. TUNING FORKS FOR PITCH DISCRIMINATION. by placing the left forefinger on the tip of one of its prongs:sound the other fork by striking one prong a clean light tapat a point about 14 the distance from its tip. Let the forkring about 2 sec, then damp it by resting the middle finger uponit. After an interval of 2 sec, lift the forefinger, sound the sec-ond fork (while the 1st is still damped) and damp it similarlyat the end of the 2 sec. Keep these time relations—2 sec. 1sttone, 2 sec. interval, 2 sec 2d tone—constant, and strike theforks as uniformly as possible in all S always judgesin terms of the second tone. 1Seashore (8) prescribes 1 sec. for the duration of each tone and 1 the interval. The author does not find the argument for these dura-tions conclusive, and has obtained better results in
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectpsychophysiology
