Table 1. Statistical models.
| Model | Criterion |
Predictors (within subject) |
Predictors (between subject) |
Covariates | Random effects |
| Effects of APOE, subtask, and path distance on performance | |||||
| 1a | Performance | Subtask, outgoing distance |
APOE | Age, sex | Subject, site |
| 1b | Performance | Subtask, incoming distance |
APOE | Age, sex | Subject, site |
| 1c | Performance | Subtask, (outgoing and incoming) path distance, type of distance |
APOE | Age, sex | Subject, site |
| Effects of landmark and boundary | |||||
| 2a | Performance | Goal-to-boundary distance |
APOE | Subject, site | |
| 2b | Performance | Goal-to-landmark distance |
APOE | Subject, site | |
| 2c | Distance to boundary | APOE | Subject, site | ||
| 2d | Distance to landmark | APOE | Subject, site | ||
| Effects of EC volume, APOE, subtask, and path distance on performance | |||||
| 3a | Performance | Subtask, outgoing distance |
APOE, relative EC volume |
Age, sex | Subject |
| 3b | Performance | Subtask, incoming distance |
APOE, relative EC volume |
Age, sex | Subject |
| Effects of HC volume, APOE, subtask, and path distance on performance | |||||
| 4a | Performance | Subtask, outgoing distance |
APOE, relative HC volume |
Age, sex | Subject |
| 4b | Performance | Subtask, incoming distance |
APOE, relative HC volume |
Age, sex | Subject |
| Effects of PC/RSC volume, APOE, subtask, and distance on performance | |||||
| 5a | Performance | Subtask, outgoing distance |
APOE, relative PC/RSC volume |
Age, sex | Subject |
| 5b | Performance | Subtask, incoming distance |
APOE, relative PC/RSC volume |
Age, sex | Subject |
| Mechanistic model to explain path integration performance | |||||
| 6 | Performance | Subtask, incoming distance |
EC integrated path representations during incoming phase, HC goal proximity representations during incoming phase, pmEC GLRs, PC/RSC landmark representations |
Subject | |