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Results of the descriptive statistics of behavioral engagement.
| Data sources | Dimension of measurement | Question feedback | Sample size | Average value | Standard deviation |
| Questionnaire | Behavioral engagement | No feedback | 30 | 17.83 | 2.67 |
| Simple feedback | 30 | 18.10 | 2.79 | ||
| Elaborated feedback | 31 | 19.74 | 2.97 | ||
| Brain wave instrument | Duration of study | No feedback | 30 | 469.67 | 15.09 |
| Simple feedback | 30 | 490.33 | 25.32 | ||
| Elaborated feedback | 31 | 510.19 | 26.90 |
