PATTERN-DISCRIMINATION IN VERTEBRATES 353 



TABLE 1 — Continued 



"*i G 



O <U 



Date Su •§ * -g o g Remarks 



o 



Feb. 5 2.230 10 2 



" 6 2.230 15 10 



" 7 2.230 10 5 



" 8 2.230 10 5 



" 9 2.230 10 5 



" 10 2.230 10 5 



" 11 2.230 10 4 Regarded as not being affected by stimulus- 

 difference. 



" 12 7.804 10 2 



" 13 5.204 10 5 Size of striae reduced to avoid parallax disturbance. 



" 15 5.204 10 5 Sniffing habit interrupted. 



" 16 5.204 10 8 Sniffed three times; made two wrong choices. 



" 17 5.204 10 9 Sniffed at one trial; chose wrong alley. 



" 18 5.204 10 9 Sniffed at one trial; chose wrong alley. 



" 19 3.902 10 3 Disturbed by punishment; preference for Rfb. 



" 20 3.902 10 6 Preference for Rfb; no sniffing. 



" 21 3.902 10 7 



" 22 3.902 10 5 



" 23 3.902 10 6 



" 24 3.902 10 7 



" 25 3.902 10 8 



" 26 3.902 10 6 



" 27 3.902 10 7 



" 28 3.902 20 11 



Mar. 1 3.902 20 15 Sniffed at two trials; both choices wrong. 



" 2 3.902 10 6 No sniffing. 



" 3 3.902 10 7 



" 4 3.902 10 5 Invariable choice of Rfb; punishment increased. 



" 5 3.902 10 4 Preference for Rfb; greatly disturbed by punish- 

 ment. 



" 9 3.902 10 8 No position preference; less excitable than before 



rest. 



" 10 3.902 10 8 



"11 3.902 10 8 Considered ready for control. 



" 11 3.720 10 5 Sniffed at three trials after making two errors; 



both choices wrong. 



" 12 3.720 10 7 



" 13 3.720 10 8 



" 14 3.720 10 8 



" 15 3.720 15 12 Preference for Rfb; punishment increased. 



"16 3 . 720 10 5 Preference for Rfb. 



"17 3 . 720 10 4 Preference for Rfb. 



" 18 3.720 10 8 Preference for Rfb. 



" 21 3.720 10 6 No work since 18th; preference for Rfb. 



" 23 3.720 10 8 Not worked previous day; preference for Rfb. 



" 24 3.720 10 8 Preference for Rfb. 



"25 3 . 720 10 8 Preference for Rfb. 



" 26 3.720 10 7 Preference for Rfb. 



"27 3.720 10 7 No position preference. 



Apr. 5 3.720' 10 5 



" 6 3.720 10 8 



" 7 3.720 10 5 



