HABIT FORMATION IN ALBINO RATS 



21 



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



relative brain weight of the +B rats Hes 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 Illa 



The Maze 



Daily Learning Averages of -fB and — B Normal Control Rats 

 (Time in seconds) 



Day 1 Day 2 Day 3 Day 4 Day 5 



Control +B 849.458 187.729 88.511 36.160 29.689 



Control— B 248.380 52.997 27.857 15.085 22.557 



Day 6 Day 7 Day 8 Day 9 Day 10 



Control +B 20.093 15.822 13.066 10.276 12.964 



Control— B 15.320 11.550 11.223 14.063 7.110 



Day 11 Day 12 Day 13 Day 14 Day 15 



Control +B 8.142 9.544 8.907 7.476 9.289 



Control— B 6.652 6.393 6.190 6.475 5.768 



Day 16 Day 17 Day 18 Day 19 Day 20 



Control +B 6.702 7.822 7.067 7.467 7.040 



Control— B 6.675 5.382 5.025 " 5.265 4.959 



Day 21 Day 22 Day 23 Day 24 Day 25 



Control +B 6.529 6.973 6804 6.719 6.102 



Control— B 4.956 4.948 4.888 4.892 4.908 



Day 26 Day 27 Day 28 Day 29 Day 30 



Control +B 6.031 6.156 6.240 6.280 6.142 



Control— B 4.908 4.908 4.908 4.908 4.908 



Day 31 Day 32 Day 33 Day 34 Day 35 



Control +B 6.756 6.294 6.006 6.287 5.842 



Control— B 4.908 4.908 4.908 4.908 4.908 



Day 36 Day 37 Day 38 Day 39 Day 40 



Control +B 5.758 5.704 5.887 5.971 5.861 



Control— B 4.908 4.908 4.908 4.908 4.908 



Day 41 Day 42 Day 43 Day 44 Day 45 



Control +B 5.923 6.461 5.999 5.706 6.159 



Control— B 4.908 4.908 4.908 4.908 4.908 



Day 46 Day 47 Day 48 Day 49 Day 50 



Control +B 5.791 5.501 5.466 5.586 5.643 



Control— B 4.908 4.908 4.908 4.908 4.908 



Day 51 Day 52 Day 53 Day 54 Day 55 



Control +B 5.874 5.963 5.572 6.559 5.732 



Control— B 4.908 4.908 4.908 4.908 4.908 



Day 56 Day 57 Day 58 Day 59 Day 60 



Control +B 5.679 5.546 5.959 5.690 5.723 



Control— B 4.908 4.908 4.908 4.908 4.908 



