Semantic memory

Saumier, Daniel; Chertkow, Howard

doi:10.1007/s11910-002-0039-9

Cited by 33 publications

(17 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the right hemisphere (especially the right parietal cortex) is traditionally coupled with visuospatial function and CDT performance has been explained at least partly by this function [3][4][5] , no previous functional imaging study has provided any evidence for the relationship between CDT performance and the right hemisphere function in AD. In a SPECT study adopting the voxel-based analysis, Nagahama et al [6] reported that the impaired CDT performance in patients with AD is related to the dysfunction in the left posterior temporal cortex, which may be related to semantic memory [24] . On the basis of their results, they suggested that the impaired CDT performance in patients with AD might be associated mainly with their deficit in semantic knowledge.…”

Section: Discussionmentioning

confidence: 99%

Neural Correlates of the Clock Drawing Test Performance in Alzheimer’s Disease: A FDG-PET Study

Lee

Seo²,

Choo³

et al. 2008

Dement Geriatr Cogn Disord

View full text Add to dashboard Cite

Background/Aim: This study aimed to identify the functional neuroanatomical correlates of impaired clock drawing test (CDT) performance in patients with Alzheimer’s disease (AD). Method: The CDT was administered to 71 patients with AD, and regional cerebral glucose metabolism (rCMglc) was measured by positron emission tomography (PET). Correlations between CDT scores and rCMglc were examined on a voxel-by-voxel basis. Results: Significant positive correlations were found between CDT performance and rCMglc in the right inferior parietal lobule and right posterior cingulate cortex. Conclusion: These results provide the first PET evidence that poor CDT performance in patients with AD is closely related to the functional decline in the right hemisphere, especially the right parietal cortex.

show abstract

Section: Discussionmentioning

confidence: 99%

Neural Correlates of the Clock Drawing Test Performance in Alzheimer’s Disease: A FDG-PET Study

Lee

Seo²,

Choo³

et al. 2008

Dement Geriatr Cogn Disord

View full text Add to dashboard Cite

show abstract

“…The left posterolateral temporal association cortex is implicated in semantic memory processing. Functional neuroimaging studies of lexical semantic memory frequently show posterolateral temporal activation for multiple semantic categories, and point towards the posterior region of the left temporal lobe as the major neuroanatomic substrate of semantic memory [19] . A previous study suggested that the CDT defi cits in AD are related to semantic impairments [9] .…”

Section: Discussionmentioning

confidence: 99%

Neural Correlates of Impaired Performance on the Clock Drawing Test in Alzheimer’s Disease

Nagahama

Okina²,

Suzuki³

et al. 2005

Dement Geriatr Cogn Disord

View full text Add to dashboard Cite

To identify the neural correlates for impaired performance on the clock drawing test (CDT) in patients with Alzheimer’s disease (AD), we examined the relationship between the CDT performances and the regional cerebral blood flow (rCBF) in 100 AD patients. The patients were equally divided into a mildly impaired CDT group, a severely impaired CDT group, and two normal CDT groups, with age and dementia severity matched. Between-group comparisons revealed that rCBF reduction in the posterolateral region of the left temporal lobe was consistently associated with mild to severe impairment of the CDT in AD. Correlation analysis also showed that the rCBF in the left posterolateral temporal cortex was linearly correlated with CDT performance. The CDT scores in AD were significantly improved for the copy condition relative to the drawing-to-command condition. These findings suggest that CDT performance has a close relationship with the left posterior temporal function, and that semantic memory deficit may at least partly contribute to impaired CDT performance in AD.

show abstract

“…Semantic memory refers to the memory which is learned by people, such as meanings, understandings, conceptbased knowledge, and work-related skills, and facts [50]. Episodic memory refers to the memory which is explicitly located in the past involving the specific events and situations, such as times, places, associated emotions, and other contextual knowledge [51], [52].…”

Section: B Encoding Episodic and Semantic Features (Block 1)mentioning

confidence: 99%

Introducing Memory and Association Mechanism Into a Biologically Inspired Visual Model

Qiao

Tang

et al. 2014

IEEE Trans. Cybern.

View full text Add to dashboard Cite

A famous biologically inspired hierarchical model (HMAX model), which was proposed recently and corresponds to V1 to V4 of the ventral pathway in primate visual cortex, has been successfully applied to multiple visual recognition tasks. The model is able to achieve a set of position- and scale-tolerant recognition, which is a central problem in pattern recognition. In this paper, based on some other biological experimental evidence, we introduce the memory and association mechanism into the HMAX model. The main contributions of the work are: 1) mimicking the active memory and association mechanism and adding the top down adjustment to the HMAX model, which is the first try to add the active adjustment to this famous model and 2) from the perspective of information, algorithms based on the new model can reduce the computation storage and have a good recognition performance. The new model is also applied to object recognition processes. The primary experimental results show that our method is efficient with a much lower memory requirement.

show abstract

Semantic memory

Cited by 33 publications

References 46 publications

Neural Correlates of the Clock Drawing Test Performance in Alzheimer’s Disease: A FDG-PET Study

Neural Correlates of the Clock Drawing Test Performance in Alzheimer’s Disease: A FDG-PET Study

Neural Correlates of Impaired Performance on the Clock Drawing Test in Alzheimer’s Disease

Introducing Memory and Association Mechanism Into a Biologically Inspired Visual Model

Contact Info

Product

Resources

About