Increasing honesty in humans with noninvasive brain stimulation

Area of Science:

• Neuroscience
• Social Science
• Behavioral Economics

Background:

• Honesty is vital for societal functioning, yet dishonesty is widespread, causing significant economic and social issues.
• The neurobiological underpinnings of honest behavior remain largely unexplored.
• Understanding the neural basis of honesty is crucial for developing interventions.

Purpose of the Study:

• To investigate the neurobiological mechanisms supporting honest behavior.
• To determine if noninvasive brain stimulation can enhance honesty.
• To explore the role of the right dorsolateral prefrontal cortex in regulating honesty.

Main Methods:

• A die-rolling task was used to assess participants' propensity for dishonesty when personal financial gain was involved.
• Transcranial direct current stimulation (tDCS) was applied over the right dorsolateral prefrontal cortex in an experimental group.
• A control group received sham stimulation, and behavioral outcomes were compared between groups.

Main Results:

• tDCS significantly reduced cheating behavior compared to the control condition.
• The increase in honesty was specific to situations where dishonesty benefited the individual, not others.
• The effect was independent of changes in material self-interest, moral beliefs, impulsivity, risk-taking, or mood.

Conclusions:

• Noninvasive brain stimulation, specifically tDCS over the right dlPFC, can effectively enhance honesty.
• The findings suggest dedicated neural mechanisms for resolving conflicts between honesty and self-interest.
• This research opens avenues for interventions to promote honest behavior.