Brain activity in the prefrontal cortex during cancelation tasks: Effects of the stimulus array

Area of Science:

• Neuroscience
• Cognitive Psychology
• Medical Imaging

Background:

• Cancelation tasks are standard for assessing selective attention and visual search.
• Limited research exists on how array conditions affect prefrontal cortex (PFC) activity and its link to developmental traits.

Purpose of the Study:

• To investigate the impact of different array conditions (structured vs. random) on PFC oxygenated hemoglobin (oxy-Hb) concentrations during cancelation tasks.
• To explore the association between task performance, PFC activity, and attention-deficit/hyperactivity disorder (ADHD) characteristics.

Main Methods:

• 24 healthy adults performed two-block-design cancelation tasks with structured and random arrays.
• Near-infrared spectroscopy measured PFC oxy-Hb concentrations.
• Performance metrics (correct/incorrect responses, hit ratio, performance score) and ADHD-Rating Scale-IV were analyzed.

Main Results:

• Higher correct responses and performance scores were observed in the random array condition.
• PFC oxy-Hb concentration significantly increased during the tasks.
• A significant correlation between task performance and ADHD characteristics was found in the structured array, but not the random array.

Conclusions:

• PFC activity, indicated by oxy-Hb changes, is associated with selective attention.
• Cancelation tasks using structured arrays show potential for evaluating ADHD characteristics.