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10 "2 EXPERIMENT iI: APPLICATION OF THE
ADULT SUBJECTS.
MUTTIPLE DECISION PROCEDURE
93
iN
Experiment II was designed to determine: 1. whether or not t,here was
a fluctuation in the perception of the purkinje shift; 2. whether the
response of subjects to the purkinje shift in the Rapid Dark Adaptation
Test (Thornton, 1977 ) had a cyclical nature.
Subjects for this experiment were the same adult subjects involved
in
experiment I. The test used was the MuItiple Decision Procedure and
the
testing procedure is described under Methods.
Results of experiment II are given in Table 23 and 24. À11 subjects,
except one (subject 2), successfully completed the test over the entire
testing days. Subject 2 tailed to complete the test in less than 10
minutes during the first two days of the test. Each of the test times
recorded for subject 2 during the last three days of the test were
higher than that recorded for any of the other subjects on any of the
five testing days. The mean test times for subject 2, in Thornton's
Rapid Dark Adaptation Test (nxperiment I), was also observed to be
higher than that recorded for any of the other 4 subjects. The mean
times for Trials II and III for 4 of the 5 subjecLs for completion of
the Multiple Decision Procedure on days I,II,III,IV,and V were 300,
208.6, '188.6' 189,and 173.5 secondsrrespectively. The mean test time
for the four subjecLs over the five days was 207.9 seconds. A mean time
of. 173.2 seconds rvas reported for 5 subjecLs for 4 tests (Sevenhuysen,
1984). Sources of variability in the Multiple Decision procedure are
given in Table 24. Significant subject-effect (p