Aphasic acalculia is seen in patients with various types of aphasia. Broca's aphasics have defects derived from linguistic changes, which are numeric-symbolic in nature. Wernicke aphasics have altered visual-spatial processes which are a significant factor in the calculation problems. Conduction aphasics will also be examined below.
These three types of
aphasia are
Broca's aphasics
Broca's Area (www.answers.com)
Since the defects in
calculation seen in Broca's aphasics are linguistic in nature, these individuals
often have impairments in the numbers (eg, 15 is read
as 50) and they have a hard time morphologically when reading
Also, these individuals will be likely to omit words when converting numbers in
their digit form to the word form or the inverse of this task (eg, "110" to "one
hundred ten", this is known as a transcoding task) (Rosselli and Ardila, 1990).counting numbers backwards.
Wernicke's aphasics
Wernicke's Area (www.thebestlinks.com)
These individuals have
when solving mathematical problems that results in trouble retaining elements of
the problem. In addition, defects in verbal memory problem (eg, 125
written as 102005) and lexicalization(eg, 125 written as 1 25)
errors are common.decomposition
Conduction Aphasics
Conduction aphasia is
an uncommon form of aphasia and believed to be caused by a disruption of the
fiber pathways that connect Broca's area and Wernicke's area. This fiber
pathway is known as the
The arcuate fasciculus. (http://www.ruf.rice.edu/~lngbrain/)
In conduction aphasics
it is possible that both . This is
due to the left parietal lobe damage in conduction aphasics, which is close to
the angular gyrus, the area suspected for anarithmetia. associated with primary acalculia (anarithmetia)
(Ardila, 2008) |