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2018 ; 113
(ä): 61-67
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Agnosia for bird calls
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Muhammed L
; Hardy CJD
; Russell LL
; Marshall CR
; Clark CN
; Bond RL
; Warrington EK
; Warren JD
Neuropsychologia
2018[May]; 113
(ä): 61-67
PMID29572063
show ga
The cognitive organisation of nonverbal auditory knowledge remains poorly
defined. Deficits of environmental sound as well as word and visual object
knowledge are well-recognised in semantic dementia. However, it is unclear how
auditory cognition breaks down in this disorder and how this relates to deficits
in other knowledge modalities. We had the opportunity to study a patient with a
typical syndrome of semantic dementia who had extensive premorbid knowledge of
birds, allowing us to assess the impact of the disease on the processing of
auditory in relation to visual and verbal attributes of this specific knowledge
category. We designed a novel neuropsychological test to probe knowledge of
particular avian characteristics (size, behaviour [migratory or nonmigratory],
habitat [whether or not primarily water-dwelling]) in the nonverbal auditory,
visual and verbal modalities, based on a uniform two-alternative-forced-choice
procedure. The patient's performance was compared to healthy older individuals of
similar birding experience. We further compared his performance on this test of
bird knowledge with his knowledge of familiar human voices and faces. Relative to
healthy birder controls, the patient showed marked deficits of bird call and bird
name knowledge but relatively preserved knowledge of avian visual attributes and
retained knowledge of human voices and faces. In both the auditory and visual
modalities, his knowledge of the avian characteristics of size and behaviour was
intact whereas his knowledge of the associated characteristic of habitat was
deficient. This case provides further evidence that nonverbal auditory knowledge
has a fractionated organisation that can be differentially targeted in semantic
dementia.
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