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The main effect for group was explored using
independent sample t-tests with a Bonferroni correction.
Since the difference between the LH NCS and the RH NCS was
not significant [T(l,22) = -1.247, P = .2254], these group
were combined. Using the Bonferroni correction of P < .017,
as the significance level, the RHD group displayed
significantly smaller SCRs compared to the CONS [T(l,33) =
2.60, P < .017], but not the LHD group. The means and
standard deviations are as follows: RHD group (mean=5.08,
sd=8.93), LHD group (mean=8.12, sd=14.31), CONS (mean=14.30,
sd=11.14). A table of the t-tests, Table C-26, is presented
in Appendix C.
The main effect of tone revealed that the high tone was
associated with a significantly higher response (mean=13.98)
than the low tone (mean=7.16).
The main effect of block was explored using paired t-
tests with a Bonferroni correction based on six comparisons,
P < .008. The results revealed that the SCR was greater
during block 1 (mean=16.13, sd=17.39) compared to block 2
(mean=9.84, 13.96) [T(1,46) = 4.24, P < .001], block 3
(mean=8.08, sd=13.09) [T(l,46) = 4.57, P < .0001], and block
4 (mean=8.22, sd= 15.20) [T(l,46) = 4.30, P < .0001. Blocks
2 and 3, 2 and 4, and 3 and 4 were not significantly
different from one another. Table C-27 in Appendix C
contains the values from the t-tests.