Figure 3

Cross-correlation coefficients of all subjects (thin lines) together with the average cross-correlative curve (bold line) and the upper 95% confidence limit (dashed line). When averaged across all subjects, the correlation across plasma (PLCort) and salivary (SACort) cortisol peaks at a time-shift of approximately -12 min, with PLCort preceding SACort. The average correlation is non-significant (at the 95% level) with zero time-shift.