Attention is a cognitive and psychobiological variable that lacks objective measures in natural contexts of formal learning. However, it can be objectively measured from the heart autonomic activity. In the present study, the validity and reliability of a system for recording heart rate variability are demonstrated. Twelve prototypes were created and paired with standard electrocardiogram. Long segments with cardiac pulse recordings were used within ten minutes. A highly significant correlation index (p < 0.01) and a significantly high Cronbach’s alpha were obtained. In the variance analysis, all data analyzed presented a value of p < 0.05. It is concluded that there is no significant variation between paired systems; therefore, the attention detection system based on heart rate variability is valid and reliable.
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