title: Verbal numerosity estimation deficit in the context of spared semantic representation of numbers: a neuropsychological study of a patient with frontal lesions.
abstract: Patients with frontal lobe damage have been shown to produce implausible answers in cognitive estimation, a task requiring approximate answers to quantity-related questions of general semantic knowledge. We investigated a patient with frontal lobe damage who presented executive deficits and difficulties in cognitive estimation. The patient also showed difficulties in verbal numerosity estimation (approximately evaluating the quantity of visually presented sets of items), as he produced extreme answers well outside healthy participants' range of answers. A series of tasks evidenced intact number processing and well preserved semantic representation of numbers. Detailed investigation of estimation processes suggested a deficit at the level of translation from an intact semantic representation of numbers to output, whether verbal or non-symbolic. This case study allows disentangling different processes involved in estimation and contributes to a better understanding of the cognitive estimation deficits frequently reported for patients with frontal lesions.
authors.affiliation: INSERM, U562, Cognitive Neuroimaging Unit, F-91191 Gif/Yvette, France. susannahrevkin@gmail.com
authors.forename: Susannah K
authors.initials: SK
authors.lastname: Revkin
authors.forename: Manuela
authors.initials: M
authors.lastname: Piazza
authors.forename: Véronique
authors.initials: V
authors.lastname: Izard
authors.forename: Laura
authors.initials: L
authors.lastname: Zamarian
authors.forename: Elfriede
authors.initials: E
authors.lastname: Karner
authors.forename: Margarete
authors.initials: M
authors.lastname: Delazer
mesh_terms: D000328:Adult; D001930:Brain Injuries / Q000150:complications / Q000473:pathology*; D002755:Choice Behavior / Q000502:physiology; D003072:Cognition Disorders / Q000209:etiology*; D005260:Female; D005625:Frontal Lobe / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008433:Mathematics; D009483:Neuropsychological Tests; D011597:Psychomotor Performance / Q000502:physiology; D012660:Semantics; D018709:Statistics, Nonparametric; D014057:Tomography, X-Ray Computed; D014705:Verbal Behavior / Q000502:physiology*