Dissociation between verbal response initiation and suppression after prefrontal lesions

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neurology

Background:

• Prefrontal damage can lead to reduced behavioral initiation and impaired suppression of automatic behaviors.
• The precise relationship between lesion location and these specific deficits remains unclear.
• Understanding these deficits is crucial for diagnosing and managing neurological conditions.

Purpose of the Study:

• To investigate the cerebral correlates of behavioral initiation and suppression abilities.
• To identify specific prefrontal regions associated with deficits in these functions using the Hayling Sentence Completion Test.
• To differentiate the neural underpinnings of initiation versus suppression.

Main Methods:

• Utilized the human lesion approach with 45 patients exhibiting focal brain lesions.
• Employed the Hayling Sentence Completion Test to assess initiation and suppression.
• Combined classical group analysis with two voxel-based lesion mapping techniques.

Main Results:

• Identified critical prefrontal regions impacting Hayling Test performance in both initiation and suppression.
• Medial rostral prefrontal cortex (Brodmann area 10) demonstrated a crucial role in behavioral initiation.
• Posterior inferolateral lesions caused deficits in both initiation and suppression, while orbitoventral lesions were linked to suppression errors.

Conclusions:

• Specific prefrontal regions are critical for distinct components of adaptive behavior, particularly initiation and suppression.
• Medial rostral prefrontal cortex (BA 10) is vital for initiating behaviors.
• Findings inform clinical practice by highlighting brain regions essential for neuropsychological testing and adaptive behaviors.