The authors will enroll patients with a diagnosis of anxiety and/or depression disorders (DSM-IV) and they will divide them in two groups: 1) conventional therapy (Control) and 2) conventional therapy associated with SKY (Treatment) for 15 days. Anxiety and depression levels will be determined using quantitative questionnaires. For the assessment of CAC and cardiorespiratory coupling, cardiorespiratory traces will be analyzed using monovariate and bivariate autoregressive spectral analysis, respectively.