Table 4. Rule-Plus Exception Category Structure (Davis, Love, & Preston, 2012b).
| Category | Item type | D1 | D2 | D3 | D4 |
|---|---|---|---|---|---|
| Note. Participants in this study learned to categorize based on the first eight stimuli (Item Type: “Train”). By attending only to the first feature (“D1”), participants would be able to categorize three of the four stimuli within each category. Exception items (marked with an asterisk) violate this simple rule, and thus require attention to other features. After category training, item recognition for the rule-following and exception items is compared via a two-alternative forced choice task, involving comparison to eight additional test items (Item Type: “Test”). | |||||
| A | Train* | 2 | 2 | 2 | 2 |
| A | Train | 1 | 1 | 1 | 2 |
| A | Train | 1 | 1 | 2 | 1 |
| A | Train | 1 | 2 | 1 | 1 |
| B | Train* | 1 | 2 | 2 | 2 |
| B | Train | 2 | 1 | 1 | 2 |
| B | Train | 2 | 1 | 2 | 1 |
| B | Train | 2 | 2 | 1 | 1 |
| — | Test | 1 | 1 | 1 | 1 |
| — | Test | 1 | 1 | 2 | 2 |
| — | Test | 1 | 2 | 1 | 2 |
| — | Test | 1 | 2 | 2 | 1 |
| — | Test | 2 | 1 | 1 | 1 |
| — | Test | 2 | 1 | 2 | 2 |
| — | Test | 2 | 2 | 1 | 2 |
| — | Test | 2 | 2 | 2 | 1 |