TABLE 2.
Left-right check (macaque data).
| Flipped* | %Correct | Unflipped∗ | %Correct | |
| ION | 3 | 100% | 2 | 100% |
| Newcastle | 3 | 100% | 6 | 100% |
| NIN | 2 | 50% | 0 | – |
| SBRI | 0 | – | 1 | 100% |
| UMinn | 1 | 0% | 1 | 100% |
| Total** | 9 | 78% | 10 | 100% |
Results of running AFNI’s left-right flip check on several publicly available macaque datasets using afni_proc.py. Datasets were randomly assigned to a “flipped” group (anatomical volume left-right flipped before analysis) or to an “unflipped” group (no changes performed). While the check correctly categorized datasets in most cases (17 out of 19), the high degree of left-right symmetry in macaques made cost function discrimination difficult for several outputs. *Skullstripping and/or EPI-anatomical alignment failed in four additional “flipped” and three additional “unflipped” cases (7 out of a total 26 downloaded), and so were not included in this table. **In four “flipped” and three “unflipped” cases included in the table (7 out of a total 19 successfully analyzed), the final cost function values were extremely close, making them difficult to differentiate in practice.