GREEN-RED TESTS
Brightnesses Different for Human Eye
No.
2 No. 5
SERIES DATE BRIGHTNESS RIGHT WRONG
RIGHT WRONG
VALUES
(GREEN) (RED) (GREEN) (RED)
1 May 7 Green
Red 1800 c.m. 10 10 12 8
2 8 Same 12 8 11 9
3 9 Same 15 5 14 6
4 10 Same 18 2 12 8
5 11 Same 18 2 14 6
6 12 Same 19 1 16 4
7 13 Same 19 1 18 2
8 14 Same 20 0 20 0
Brightness tests without colors were now given to
determine whether the mice had been choosing the brighter
or the darker instead of the green.
NO.
2 NO. 5
SERIES DATE BRIGHTNESS VALUES
RIGHT WRONG RIGHT WRONG
(GREEN) (RED)
(GREEN) (RED)
8a 14 Brighter 74 c.m.
0[1] 10[2] 2[1] 8[2]
Darker 3 c.m.
9 15 3 c.m. on left
1800 c.m. on right 8 12
16 4
10 16 4 c.m. on left
36 c.m. on right 5 5
7 3
11 16 Green 4 c.m.
Red 36 c.m. 9 1
8 2
12 17 11 c.m. on left
1800 c.m. on right 7 3
6 4
13 17 Green 11 c.m.
Red 1800 c.m. 9 1
8 2
14 18 Mixed values
3 to 1800 c.m. 7 3
8 2
15 19 Same 7 3
7 3
16 20 Same 7 3
7 3
17 21 Same 7 3
9 1
18 22 Same 9 1
8 2
19 23 Same 7 3
9 1
20 24 Same 10 0
8 2
21 25 Same 10 0
9 1
22 26 Same 9 1
10 0
[Footnote 1: Brighter] [Footnote 2: Darker]
Immediately after the brightness series, the influence
of making first one color, then the other, the brighter
was studied. Throughout series 9 the brightness
value of the left box remained 3 candle meters, that
of the right side 1800 candle meters. Number
2 was so badly confused by this change that his mistakes
in this series numbered 12; No. 5 made only 4 incorrect
choices. Then series after series was given under
widely differing conditions of illumination.
The expression “mixed values,” which occurs
in Table 26 in connection with series 14 to 22 inclusive,
