VISUAL PERCEPTION OF THE CHICK 



63 



areas were equal (series 8 and 9, March 28), but when the 

 inscribed triangle was substituted for the standard, the chick 

 was again confused. Series 13, (March 29), another control 

 where the triangle was inverted, gave more decided negative 

 results which were immediately preceded and followed by al- 

 most perfect reactions. As a further test of inverting the tri- 

 angle, the inversion was made during a regular series, 15, 

 (March 30). The result of the inversion during tests 5-7 was 

 one right choice out of three chances with an average time of 



TEST SHEET 



Title of investigation, Form: A 28H O 63-f- 



Experimented on, 21 



Harvard Psychological Laboratory, March 18, 1912 



Record Sheet, 2; Series, 24 



6-4-56.3 



39 seconds. These three special tests were preceded and fol- 

 lowed, during the same series, with perfect reactions (triangle 

 upright) the average time of which was somewhat less than one- 

 sixth of the average time for the special tests. 



In connection with these results, the details of the behavior 

 of No. 21 are presented when it was confronted with A 28 + 

 — o 63+ stimuli. These tests are reported in table 7 as series 

 24 and 25. The test sheets show how utterly confusing to the 

 chick was this condition. The results of this test were verified 



