Possible Neurocognitive Mechanisms Underlying the Response Delay Effect
| Mechanism . | Motor Evoked Potential . | Electromechanical Delay . | Activation of “Stopping” Regions . |
|---|---|---|---|
| Active braking | Go critical < go noncritical (before/after go stimulus) | Go critical > go noncritical | Go critical > go noncritical |
| Prolonged decision stage | Go critical < go noncritical (after go stimulus) | No difference | No differencea |
| Slower response facilitation | Go critical < go noncritical (after go stimulus) | Go critical > go noncritical | No difference |
| Mechanism . | Motor Evoked Potential . | Electromechanical Delay . | Activation of “Stopping” Regions . |
|---|---|---|---|
| Active braking | Go critical < go noncritical (before/after go stimulus) | Go critical > go noncritical | Go critical > go noncritical |
| Prolonged decision stage | Go critical < go noncritical (after go stimulus) | No difference | No differencea |
| Slower response facilitation | Go critical < go noncritical (after go stimulus) | Go critical > go noncritical | No difference |
Different mechanisms make different predictions for MEP, electromechanical delay, and functional MRI data.
aDepending which regions are activated, this could be compatible with more than one mechanism.