We describe two acalculic patients, one with a left subcortical lesion and the other with a
right inferior parietal lesion and Gerstmann's syndrome. Both suffered from “pure …

Numerical abilities are thought to rest on the integration of two distinct systems, a verbal
system of number words and a non-symbolic representation of approximate quantities. This …

In this study we investigated the acalculic condition of a patient, CG, with the classical signs
of Gerstmann's Syndrome: finger agnosia; right-left disorientation; a profound agraphia (but …

A patient is described who is affected by an inability to recall and use 'arithmetical facts' of
one-digit multiplications and divisions. This loss contrasts with the preservation of a wide set …

Recent studies in human neuroimaging, primate neurophysiology, and developmental
neuropsychology indicate that the human ability for arithmetic has a tangible cerebral …

Positron emission tomography was used to localize the cerebral networks specifically
involved in three basic numerical processes: arabic numeral processing, numerical …

We report the case of an aphasic and acalculic patient with selective preservation of
approximation abilities. The patient's deficit was so severe that he judged 2+ 2= 5 to be …

Mental calculation is a complex cognitive operation that is composed of a set of distinct
functional processes. Using functional magnetic resonance imaging (fMRI), we mapped …

We present the case of a young, highly educated patient who showed severe problems in
basic arithmetic after a bone marrow transplant followed by extensive irradiation and …

There is debate as to the relationship between mathematical ability and language. Some
research has suggested that common processes underlie arithmetic and grammar while …