Selective preservation of the beat in apperceptive music agnosia: a case study

Baird, Amee D., Walker, David G., Biggs, Vivien and Robinson, Gail A. (2014) Selective preservation of the beat in apperceptive music agnosia: a case study. Cortex, 53 1: 27-33. doi:10.1016/j.cortex.2014.01.005

Author Baird, Amee D.
Walker, David G.
Biggs, Vivien
Robinson, Gail A.
Title Selective preservation of the beat in apperceptive music agnosia: a case study
Journal name Cortex   Check publisher's open access policy
ISSN 0010-9452
Publication date 2014-01-13
Sub-type Article (original research)
DOI 10.1016/j.cortex.2014.01.005
Volume 53
Issue 1
Start page 27
End page 33
Total pages 7
Place of publication Milan, Italy
Publisher Elsevier Masson
Language eng
Formatted abstract
Introduction: Music perception involves processing of melodic, temporal and emotional dimensions that have been found to dissociate in healthy individuals and after brain injury. Two components of the temporal dimension have been distinguished, namely rhythm and metre. We describe an 18 year old male musician 'JM' who showed apperceptive music agnosia with selectively preserved metre perception, and impaired recognition of sad and peaceful music relative to age and music experience matched controls after resection of a right temporoparietal tumour.

Method: Two months post-surgery JM underwent a comprehensive neuropsychological evaluation including assessment of his music perception abilities using the Montreal Battery for Evaluation of Amusia (MBEA, Peretz, Champod, & Hyde, 2003). He also completed several experimental tasks to explore his ability to recognise famous songs and melodies, emotions portrayed by music and a broader range of environmental sounds. Five age-, gender-, education- and musical experienced-matched controls were administered the same experimental tasks.

Results: JM showed selective preservation of metre perception, with impaired performances compared to controls and scoring below the 5% cut-off on all MBEA subtests, except for the metric condition. He could identify his favourite songs and environmental sounds. He showed impaired recognition of sad and peaceful emotions portrayed in music relative to controls but intact ability to identify happy and scary music.

Conclusion: This case study contributes to the scarce literature documenting a dissociation between rhythmic and metric processing, and the rare observation of selectively preserved metric interpretation in the context of apperceptive music agnosia. It supports the notion that the anterior portion of the superior temporal gyrus (STG) plays a role in metric processing and provides the novel observation that selectively preserved metre is sufficient to identify happy and scary, but not sad or peaceful emotions portrayed in music. 
Keyword Apperceptive amusia
Temporal processing
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Psychology Publications
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Created: Fri, 28 Feb 2014, 23:30:29 EST by Gail Robinson on behalf of School of Psychology