Table 5 MRS data quality on day 1 and 2 in experiment 2.

From: First-night effect reduces the beneficial effects of sleep on visual plasticity and modifies the underlying neurochemical processes

 

Day 1

Day 2

 

Shim values

14.5 ± 0.4

14.0 ± 0.2

t(14) = 1.69, p = 0.114

%SD for GABA

7.7 ± 0.6

8.0 ± 0.3

t(14) = −0.51, p = 0.620

%SD for Glx

6.0 ± 0.3

5.9 ± 0.2

t(14) = 0.14, p = 0.892

NAA linewidth

8.3 ± 0.2

7.9 ± 0.1

t(9) = 1.83, p = 0.101

Frequency drift

1.5 ± 0.3

1.4 ± 0.2

Z = 0.18, p = 0.864

  1. Because the Shapiro‒Wilk test showed a violation of normality for the frequency drift, we used the Wilcoxon signed-rank test. The %SD represents the Cramer‒Rao lower bounds, a measure of fitting error for metabolites. The NAA linewidth and frequency drifts are also commonly used to indicate the quality of MRS data.
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