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Most frequently included criteria in studies reporting self-directed and mark-directed responses to mirrors in gorillas (%)
| Criteria | Mark-directed responses | Self-directed responses |
|---|---|---|
| Hidden Marks | 29.17 | 12.96 |
| Mature subjects | 25.00 | 20.37 |
| Cue control | 25.00 | 11.11 |
| Front v away from mirror | 20.83 | 9.26 |
| Group mirror exposure | 9.26 | |
| More than one subject | 9.26 | |
| Video recordings of responses | 9.26 | |
| Social grouping | 9.26 | |
| Post-mark observations | 9.26 |
