May 17 ............. 20 sec. confinement ........ Food in right box for each
(Aid after 10 trials) trial
" 18 to 21 ........ 30 sec. confinement ........ Food (banana) in right box
for each trial
" 22 to June 2 .... Illness, no experiments
June 3 ............... 15 sec. confinement ........ Food (banana) in right box
for each trial
" 4 ............... 30 " " ............. Food (banana) in right box
for each trial
" 5-10 ............ 60 " " ............. Beet, carrot and loquat, in
addition to banana
" 11 .............. 10 to 30 sec. confinement .. Beet, carrot and loquat, in
addition to banana
" 12 to 15 ........ 60 sec. confinement ........ Beet, carrot and loquat, in
addition to banana
" 16 .............. 60 " " ............. Banana and sweet corn--former
preferred
" 17 (1st series). 60 sec. confinement ........ Food (banana, as in early
series)
" 17 (2nd series). No confinement in wrong box; Food only for correct first
but instead, return to choices
starting point by way of
alleys
" 18 to 22 ........ No confinement in wrong box; Food only for correct first
but instead, return to choices
starting point by way of
alleys
" 22 (2nd series). No punishment; allowed to Food for each trial
enter boxes until right
one was found
" 23 .............. Return to starting point.
After five wrong choices
of a given box the animal
was held for 60 secs. in
one of the boxes and was
then released by way of
the exit door and rewarded
when the right one was
chosen
" 23 (2nd series). No punishment .............. Reward for each trial
" 24 (1st series). Return to starting point. .. Food only for correct first
choices
" 24 (2nd series). No punishment .............. Reward for each trial
" 25-30 ........... Same as on 24th ............