Table 2.
Correlations Among Handedness Measures
| Direction | Strength | |||
|---|---|---|---|---|
| Phenotypic | ||||
| Reach | Gesture | Reach | Gesture | |
| Gesture | .22 (.11, .32) | .05 (−.06, .15) | ||
| Tube | .26 (.16, .36) | .05 (−.06, .15) | .14 (.03, .24) | −.09 (−.19, .02) |
|
| ||||
| Additive Genetic | ||||
| Reach | Gesture | Reach | Gesture | |
| Gesture | −.01 (−.40, .57) | .14 (−.28, .47) | ||
| Tube | .33 (−.24, .62) | .03 (−.44, .49) | .09 (−.23, .46) | −.28 (−.58, .04) |
|
| ||||
| Additive Genetic (mother) | ||||
| Reach | Gesture | Reach | Gesture | |
| Gesture | −.18 (−.57, .45) | .26 (−.21, .49) | ||
| Tube | .45 (.01, .81) | −.21 (−.63, .38) | −.01 (−.36, .33) | −.40 (−.64, .03) |
|
| ||||
| Additive Genetic (human) | ||||
| Reach | Gesture | Reach | Gesture | |
| *Gesture | .44 (−.43, .78) | −.06 (−.44, .38) | ||
| Tube | .56 (−.31, .82) | .67 (−.40, .78) | .25 (−.82, 1.0) | −.34 (−.67, .29) |
|
| ||||
| Unique environmental | ||||
| Reach | Gesture | Reach | Gesture | |
| Gesture | .26 (.07, .57) | −.08 (−.82, .42) | ||
| Tube | .36 (.11, .51) | .08 (−.13, .29) | .26 (−.23, .46) | .05 (−.21, .37) |
|
| ||||
| Maternal environmental | ||||
| Reach | Gesture | Reach | Gesture | |
| Gesture | .00 (−.42, .40) | −.03, (−.36, .27) | ||
| Tube | .37 (−.03, .71) | −.04 (−.44, .44) | .10 (−.22, .42) | −.12 (−.41, .28) |
Phenotypic correlations point estimates from handedness indices with 95% confidence intervals in brackets. Additive genetic, unique environment, and maternal environment correlations from animal model with posterior mode and 95% coverage intervals in brackets. Correlations significantly different from 0 highlighted in bold.