title: Dissociation between verbal response initiation and suppression after prefrontal lesions.
abstract: Some of the most striking symptoms after prefrontal damage are reduction of behavioral initiation and inability to suppress automatic behaviors. However, the relation between these 2 symptoms and the location of the lesions that cause them are not well understood. This study investigates the cerebral correlates of initiation and suppression abilities assessed by the Hayling Sentence Completion Test, using the human lesion approach. Forty-five patients with focal brain lesions and 110 healthy matched controls were examined. We combined a classical group approach with 2 voxel-based lesion methods. The results show several critical prefrontal regions to Hayling Test performance, associated with either common or differential impairment in "initiation" and "suppression" conditions. A crucial role for medial rostral prefrontal cortex (BA 10) in the initiation condition was shown by both group and lesion-mapping methods. A posterior inferolateral lesion provoked both initiation and suppression slowness, although to different degrees. An orbitoventral region was associated with errors in the suppression condition. These findings are important for clinical practice since they indicate that the brain regions required to perform a widely used and sensitive neuropsychological test but also shed light on the regions crucial for distinct components of adaptative behaviors, in particular, rostral prefrontal cortex.
authors.affiliation: Institute of Cognitive Neuroscience-UCL, London WC1N 3AR, UK. emmavolle@gmail.com
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Volle
authors.forename: Angela
authors.initials: A
authors.lastname: de Lacy Costello
authors.forename: Laure M
authors.initials: LM
authors.lastname: Coates
authors.forename: Catrin
authors.initials: C
authors.lastname: McGuire
authors.forename: Karren
authors.initials: K
authors.lastname: Towgood
authors.forename: Sam
authors.initials: S
authors.lastname: Gilbert
authors.forename: Serge
authors.initials: S
authors.lastname: Kinkingnehun
authors.forename: Jane E
authors.initials: JE
authors.lastname: McNeil
authors.forename: Richard
authors.initials: R
authors.lastname: Greenwood
authors.forename: Ben
authors.initials: B
authors.lastname: Papps
authors.forename: Martin
authors.initials: M
authors.lastname: van den Broeck
authors.forename: Paul W
authors.initials: PW
authors.lastname: Burgess
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007266:Inhibition, Psychological; D033182:Intention; D008297:Male; D008875:Middle Aged; D009433:Neural Inhibition; D017397:Prefrontal Cortex / Q000503:physiopathology*; D012018:Reflex; D013060:Speech; D013064:Speech Disorders / Q000503:physiopathology*; D055815:Young Adult
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