VISUAL PERCEPTION OF THE CHICK 37 



provides for a concise summary of results. For the details of 

 behavior, a test sheet was adopted. The 10 tests, horizontally 

 arranged on the record page, appear vertically on the test page. 

 After each one is a space for recording the details of the animal's 

 behavior. At the right of the page is a narrow column for 

 recording the results of the test — whether an error was made 

 and the time for choosing. At the bottom is a space for further 

 notes. 



The manner of recording the details of the chick's behavior 

 is illustrated in the accompanying test sheet which is a record of 

 an actual series of tests. A set of symbols was used in order 

 to follow fairly accurately the movements of an animal while 

 in the discrimination chamber. Herewith is presented the key 

 to the symbols used in these experiments:^ 



1. + = Approach to right compartment. 



2. — = Approach to wrong compartment. 



3. /, //, /// = Degree of attention based on behavior and time. A horizontal 



bar above any one of these symbols indicates unusually long time in 

 this locality. For example, 

 + / = Brief consideration of right stimulus area. 



— / = Brief consideration of wrong stimulus area. 



, f + // = Longer consideration of right stimulus area. 

 ' \ — // = Longer consideration of wrong stimulus area. 



) + /// = Close consideration of right stimulus area. 

 \ — /// = Close consideration of wrong stimulus area. 



f + /// = Long time before and close consideration of right stimulus 



, I area. 



I — /// = Long time before and close consideration of wrong stimu- 

 [ lus area. 



+ 7 = Long time before but slight consideration of right stimu- 

 lus area. 



— 7 = Long time before but slight consideration of wrong stimu- 

 lus area. 



4. '"""""""" = Attention at entrance end; indifference to stimulus areas. 



5. A = Approach on wires before right stimulus followed by retreat. 



^ The symbols presented in print only approximate, as closely as is convenient, 

 the written symbols actually employed during experimental observations. Printed 

 substitutes, of courpe, are consistently presented throughout the text. The written 

 symbols used for recording observations were selected as far as possible to repre- 

 sent concisely and accurately the behavior recorded. 



