SIZE AND FORM PERCEPTION 



83 



not here attempt to show how the method was developed. 

 Only its final form can be presented. A form of record sheet 

 had previously been used in the laboratory for tabulating 

 experimental results in the discrimination method. This blank 

 was well suited to my needs. It provides spaces at the top for 

 recording the name or number of the subject, the date, and the 

 experiment. Across the sheet are 10 vertical columns in which 

 may be entered the result of each test. Each group of 10 tests 

 constitutes a series. The sheet provides for records of 25 series 

 with a space for two (A and B) preliminary or preference series. 

 The result of 250 tests, therefore, may be put on one record 

 sheet. The vertical columns headed R and W are for the total 

 number of right and wrong choices made by the subject during 

 a series of 10 tests. Another vertical column leaves space for 

 remarks. 



This record sheet does very well for keeping a concise sum- 

 mary of the experiments, but it does not enable one to keep 



TEST SHEET 



Title of investigation, Form: O 28h A 28+ 



Experimented on, 9 



Harvard Psychological Laboratory, December 25, 1912 



Record Sheet, 1 ; Series, 15 



6-4-29.5 



Remarks: — Tendency to choose by position, — i.e., to go where it last escaped. 



Usually goes directly to other compartment when it has been shocked for wrong choice. 



