| (1) infant attention | - mother attention, |
| (2) infant facial affect | - mother facial affect, |
| (3) infant vocal affect | - mother facial affect, |
| (4) infant facial-visual engagement | - mother facial-visual engagement, |
| (5) infant facial-visual engagement | - mother touch, |
| (6) infant vocal affect | - mother touch, |
| (7) infant touch | - mother touch, |
| (8) infant head orientation | - mother spatial orientation. |
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