Discrimination of shades of gray for different intervals of time.
21
not infrequent use of the note »forgot«, i. e. he cannot deliver a
judgment because the norm
has passed out of mind.
He has 69 of
these »forgots« distributed as follows:
V-= 160°
170° 180°
190°
200° White
Order N—V. . . 5
12 15
5
6
» Y—N. . . 4
4 9
7
2
total »forgot« 9
16 24
12
8
His forgotten norms follow accordingly the inverse order of the
physical brightnesses, and as is to be expected, are more numerous
in the t. o. N—V.
With reagents who maintained practically fairly like conditions of
relaxation or tension for all time intervals, we should expect different
results, so far as the »like« cases are concerned. But in general, the
writer would explain the results obtained in the above and in similar
experiments:
1. from the presence of contiguous reproduction, usually verbal,
coming from the formation of a scale of values;
2. from the presence of free judgments resulting also from the
formation of a scale of values;
3. from the relatively large number of judgments of »like« for
the shorter intervals resulting from the maintenance of com¬
mon conditions during the periods of exposure of norm and
comparison.
In conclusion the writer desires to express his thanks to Prof.
Külpe, Dr. Kinkel and Mr. Borgquist for their patient and valuable
services as reagents, and to Mr. Thompson for his skillful manip¬
ulation of the apparatus.