Sigma oscillations protect or reinstate motor memory depending on their temporal coordination with slow waves.

Interestingly, the difference in spindle amplitude was marginally significant with higher amplitudes during the auditory stimulation intervals as compared to the rest intervals (V=199; p-value = 0.065; r =0.73), whereas spindle frequency showed the opposite pattern (t=–3.42; df = 22; p-value = 0.005; Cohen’s d=0.71).

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This is just a suggestion but I think showing individual data points (and the single subject change across the three conditions) would improve understanding the highly significant effects.

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