132 



MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XV, 



Test C, cube imitation (Knox). 



Materials.— (1) Four one-inch hardwood cubes fastened securely to a wooden base 1 inch wide by }^ inch thick 

 by 12 inches long. The end cubes are 1 inch from the end of the base. The distance between the cubes is 2 inches. 

 Both cubes and base are painted a dark red. The cubes are numbered, 1 to 4, from right to left. (2) A fifth cube of 

 the same size unattached and similarly painted. (3) Ten imitation problems (a to j), as printed on record sheet. 



Directions. — Examiner places the cube board before subject at a convenient distance from him and at right angles 

 to his line of vision, with the numbered side of the cubes directed away from him and says, "Watch carefully and then 



rORNI BOARD *3 



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Problem A 

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Problem C 

 Eight's e para Ye. movtmenKs 



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Problem . B 



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Probltrr* JO 



Nine separate movements 



Fig. A. — Forni board (Test E) with pieces arranged In various problems for subject to replace. 



do just what I do. " Examiner next with the fifth cube taps the attached cubes in a predetermined order, as for example 

 in (a) 1, 2, 3, 4, at the rate of one per second. He now lays the tapping cube down before subject midway between the 

 second and the third cubes, but nearer to subject than to the cube board and says, "Do that." Before giving the second 

 trial, examiner says, "I am going to repeat each one." 



Give a second trial whether or not the first trial is correct. 



Scoring. — Record the response as right (+) or wrong ( — ), using a screen to prevent subject from seeing the score 

 which examiner records. 



(6-j) Similarly give parts (6) to (j) in order unless subject fails in five successive parts. In that event discontinue 

 the test. 



