Medication helps adults with ADHD weigh the negative consequences of their decisions

Key Points:

• A new study published in Psychological Medicine found that methylphenidate, a common stimulant medication for ADHD, improves decision-making by specifically enhancing sensitivity to the potential costs of actions rather than increasing reward sensitivity.
• The research involved 61 adults with ADHD and 63 healthy controls in a double-blind, placebo-controlled crossover design, where participants completed tasks requiring them to weigh benefits and costs associated with different stimuli.
• Unmedicated individuals with ADHD showed lower accuracy and processed cost and benefit information less efficiently, with a stronger focus on benefits over costs, whereas methylphenidate selectively improved their processing of costs, aligning their decision patterns closer to those of healthy controls.
• Unexpectedly, the medication narrowed participants' decision thresholds but increased non-decision time, possibly due to more thorough visual encoding of stimuli, which may have contributed to improved decision accuracy.
• Limitations include the possibility that medication effects relate to improved memory or working memory rather than decision-making per se, exclusion of individuals with severe psychiatric comorbidities, and potential bias from participants guessing when they received the active drug; future studies could address these by presenting values directly to reduce memory demands.