[12] Stevens, L.T.: 'On the Time Sense,' _Mind_, XI., p. 393.

The overestimation, however, is of no great significance, for data
will be introduced a little later which show definitely that the
underestimation or overestimation of a given standard is determined,
among other factors, by the intensity of the stimulation employed. The
apparently anomalous results obtained in the early investigations are
in part probably explicable on this basis.

As regards the results of _practice_, the data obtained from the two
subjects on whom the greatest number of tests was made (_Hs_ and _Sh_)
is sufficiently explicit. The errors for each successive group of 25
series for these two subjects are given in Table III.


TABLE III.

_ST_ = 5.0 SECONDS.

SUBJECT _Hs_. SUBJECT _Sh_.
CT (1) (2) (3) (4) (1) (2) (3) (4)
4. 2.5 2.5 1.5 2.5 0. .5 0. .5
4.5 6.0 3.0 3.5 7.0 5.0 3.5 2.0 .5
5. 14.0 11.0 11.0 11.0 8.5 11.5 4.0 7.0
5.5 11.5 11.5 6.0 12.5 11.0 16.0 14.0 15.0
6. 12.0 9.0 6.5 6.0 3.5 2.0 1.5 1.0
6.5 4.0 3.5 4.0 3.5 4.0 .5 0. 0.