HABIT FORMATION IN ALBINO RATS 



21 



be expected, from our hypothesis and the behavior, the average 

 relative brain weight of the +B> rats lies between that of the 

 inbreds and of the B. 



The results obtained from the supposedly normal B rats 

 reinforce the former conclusion that a lesser relative brain weight 

 is accompanied in a similar degree by a lesser ability 'to form 



habits. 



TABLE Ilia 



THE MAZE 



DAILY LEARNING AVERAGES OF +B AND B NORMAL CONTROL RATS 

 (Time in seconds) 



Day 2 Day 3 Day 4 Day 5 



187.729 88.511 36.160 29.689 

 52.997 27.857 . 15.085 22.557 



Day 1 



Control +B 849.458 



Control B.. 248.380 



Control +B. 

 Control B. 



Control +B 

 Control B, 



Control +B. 

 Control B, 



Control +B. 

 Control B 



Control +B. 

 Control B. 



Control +B 

 Control B 



Control -t-B. 

 Control B. 



Control +B. 

 Control B. 



Control +B. 

 Control B. 



Control +B. 

 Control B. 



Control +B. 

 Control B. 



Day 6 



20.093 

 15.320 



Day 11 



8.142 

 6.652 



Day 16 

 6.702 



6.675 



Day 21 



6.529 

 4.956 



Day 26 

 6.031 



4.908 



Day 31 



6.756 

 4.908 



Day 36 



5.758 

 4.908 



Day 41 

 5.923 



4.908 



Day 46 

 5.791 



4.908 



Day 51 



5.874 

 4.908 



Day 56 



5.679 

 4.908 



Day 7 



15.822 

 11.550 



Day 12 

 9.544 



6.393 



Day 17 

 7.822 

 5.382 



Day 22 

 6.973 



4.948 



Day 27 

 6.156 



4.908 



Day 32 



6.294 

 4.908 



Day 37 



5.704 

 4.908 



Day 42 

 6.461 



4.908 



Day 47 

 5.501 



4.908 



Day 52 

 5.963 



4.908 



Day 57 



5.546 

 4.908 



Day 8 

 13.066 



11.223 



Day 13 



8.907 

 6.190 



Day 18 

 7.067 



5.025 



Day 23 



6-804 

 4.888 



Day 28 



6.240 

 4.908 



Day 33 



6.006 

 4.908 



Day 38 



5.887 

 4.908 



Day 43 

 5.999 



4.908 



Day 48 



5.466 

 4.908 



Day 53 

 5.572 



4.908 



Day 58 



5.959 

 4.908 



Day 9 



10.276 

 14.063 



Day 14 



7.476 

 6.475 



Day 19 

 7.467 



5.265 



Day 24 

 6.719 



4.892 



Day 29 



6.280 

 4.908 



Day 34 

 6.287 



4.908 



Day 39 



5.971 

 4.908 



Day 44 

 5.706 



4.908 



Day 49 



5.586 

 4.908 



Day 54 

 6.559 



4.908 



Day 59 



5.690 

 4.908 



Day 10 

 12.964 



7.110 



Day 15 



9.289 

 5.768 



Day 20 

 7.040 

 4.959 



Day 25 



6.102 

 4.908 



Day 30 

 6.142 



4.908 



Day 35 



5.842 

 4.908 



Day 40 

 5.861 



4.908 



Day 45 



6.159 

 4.908 



Day 50 



5.643 

 4.908 



Day 55 



5.732 

 4.908 



Day 60 



5.723 

 4.908 



