Behavioral regression results
| Regressor | Parameter estimate (SEM) | t stat | p value |
|---|---|---|---|
| Current trial (t) stimulus type | −0.055 (0.013) | −4.31 | <0.0001 |
| Prior trial (t-1) stimulus type | 0.033 (0.013) | 2.46 | 0.01 |
| Prior trial (t-1) attractiveness | 0.019 (0.011) | 1.74 | 0.09 |
| Prior trial (t-1) RT | <0.0001 (0.013) | 0.005 | 0.99 |
To examine the effects of other trial characteristics on current trial RT, we regressed current trial RT on a model including: stimulus category (social or nonsocial) on previous trial, RT on previous trial, attractiveness rating of the previous trial’s reward, and stimulus category on current trial. Our analysis indicated that current stimulus type had the strongest effect on current RT; however, of all the characteristics from the prior trial, only prior stimulus type had a significant effect on current RT.