Table 2.
Correlation between impulsivity measures and locomotor activity (genetic and nongenetic variability)
|
|
Between strain (genetic) |
Within strain (environmental) |
||||
|---|---|---|---|---|---|---|
| Impulsivity measure |
Correlation |
p
|
Correlation |
p
|
||
| Average bias across a session | −0.922 | <0.01 | 0.129 | NS | ||
| Mean bias at longest delay (8 sec) |
−0.696 |
<0.05 |
0.097 |
NS |
||
Between-strain analysis (the genetic component of variation) revealed a significant (based on the fact that the top confidence limits do not embrace the null hypothesis value of zero correlation) negative correlation between increased choice of the large reward response (less impulsive choice) and locomotor activity measures. In contrast, the within-strain analysis (the nongenetic component of variation) revealed no such correlation.