Table 1.
Heritability estimates for impulsivity and locomotor activity
|
|
|
90% Confidence limits |
||
|---|---|---|---|---|
| Behavioral measure |
Heritability |
Non-central F
|
Monte Carlo |
|
| Average bias across a session | 0.158 | 0.037, 0.399 | 0.031, 0.399 | |
| Mean bias at longest delay (8 sec) | 0.165 | 0.042, 0.406 | 0.033, 0.402 | |
| Locomotor activity (day 3) |
0.751 |
0.652, 0.849 |
0.654, 0.850 |
|
The analysis was performed with two behavioral measures indexing impulsivity, the average choice bias across a session and the bias at the longest delay (8 sec), and stable locomotor activity scores on day 3 of testing. Confidence limits (90%) were calculated from both the non-central F distribution and Monte Carlo simulation, and these limits do not embrace the null hypothesis value of zero heritability (see Materials and Methods).