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The Selective Impairment of Semantic Memory
- E. Warrington
- PsychologyThe Quarterly journal of experimental psychology
- 1 November 1975
Evidence is presented that this impairment of semantic memory cannot be accounted for by intellectual impairment, sensory or perceptual deficits, or expressive language disorder, and some tentative evidence for the structural basis for a hierarchically organized modality-specific semantic memory system is discussed.
Categories of knowledge. Further fractionations and an attempted integration.
It is suggested that different weighting values from multiple sensory channels will be important in the acquisition of different categories of knowledge and that such differential weightings could be the basis of the categorical organization of systems in the brain subserving semantic knowledge.
Category specific semantic impairments
A quantitative investigation of the visual identification and auditory comprehension deficits of 4 patients who had made a partial recovery from herpes simplex encephalitis finds category specificity in the organization of meaning systems that are also modality specific semantic systems.
Visual capacity in the hemianopic field following a restricted occipital ablation.
Recent animal results suggest strongly that a severe penalty is inflicted when damage to neighbouring posterior cortical areas is added to that of the striate cortex, and human cases in which damage is relatively restricted to area 17, with only minimal damage to surrounding tissue have a renewed interest.
Category specific access dysphasia.
Investigations of the residual auditory-verbal comprehension skills of a global dysphasic who had sustained a major left hemisphere infarction suggest that this access impairment arose because the system had become refractory, such refractoriness being category specific.
Abstract and concrete concepts have structurally different representational frameworks.
This work reports the first evidence that abstract and concrete word meanings are based in representational systems that have qualitatively different properties, and shows that abstract concepts, but not concrete concepts, are represented in an associative neural network.
Independent Functioning of Verbal Memory Stores: A Neuropsychological Study
Five experiments are described concerning verbal short-term memory performance of a patient who has a very markedly reduced verbal span, indicating that he has a greatly reduced short- term memory capacity and showing that this cannot be attributed to a retrieval failure.
The Fractionation of Arithmetical Skills: A Single Case Study
- E. Warrington
- PsychologyThe Quarterly journal of experimental psychology…
- 1 February 1982
It was found that DRC's knowledge of the significance of individual numbers and his concept of quantity appeared to be intact, but simple addition, subtraction and multiplication were all performed laboriously and inaccurately and his performance was inconsistent from trial to trial.
Testing for nominal dysphasia.
The construction of a graded naming test that makes the distinction between object and proper names is described, prompted by a single case study of a patient who showed a specific naming impairment for a particular class of proper names.
Frontotemporal dementia with the C9ORF72 hexanucleotide repeat expansion: clinical, neuroanatomical and neuropathological features
Findings corroborate the clinical importance of the C9ORF72 mutation in frontotemporal lobar degeneration, delineate phenotypic and neuropathological features that could help to guide genetic testing, and suggest hypotheses for elucidating the neurobiology of a culprit subcortical network.