1 / 8

Paradoxical Prosopagnosia in Semantic Dementia

Paradoxical Prosopagnosia in Semantic Dementia. Sven-Erik Fernaeus, Per Östberg, Lars-Olof Wahlund, Nenad Bogdanovic NEUROTEC Karolinska Institutet. Paradoxical prosopagnosia. When X recognize faces in one condition but is unable to recognize them in another. Example from the clinic:

heba
Download Presentation

Paradoxical Prosopagnosia in Semantic Dementia

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Paradoxical Prosopagnosiain Semantic Dementia Sven-Erik Fernaeus, Per Östberg, Lars-Olof Wahlund, Nenad Bogdanovic NEUROTEC Karolinska Institutet

  2. Paradoxical prosopagnosia • When X recognize faces in one condition • but • is unable to recognize them in another. • Example from the clinic: • A patient recognized an old schoolmate at the airport, and reported this to the examining specialist, but was unable to recognize him from photographs.

  3. Method Subjects: All patients diagnosed with semantic dementia 1997-98 at the memory clinic. Five case studies. Tests: Male Faces, Political Faces, Euro Flags In addition to the clinical battery at Huddinge.

  4. Results 1. Non-verbal semantic memory: Euro Flags and Political Faces: Normal 2. Non-verbal episodic face recognition Male Faces: SUBNORMAL (random/50%) Comparable age group: 79.95%

  5. Dimensions of memory Temporal dimension (WM, recent memory, etc. & primacy-recency) Complexity (Murdock’s item memory, associative m., serial m.) + tabular m. 3. Static vs Dynamic aspects of m. 4. Agency 5. Linguistic vs non-linguistic aspects.

  6. Static & dynamic aspects Static aspects of faces Length, width, eye distance, etc 2. Dynamic aspects of faces Eye/lip movement, skin colour, other emotional expressions, head movement, etc.

  7. Hypothesis In Semantic Dementia atrophy of the inferior temporal lobe blocks the stream of information from the occipital lobe to the temporal pole, to the entorhinal cortex, and other areas. Therefore static aspects of faces in photographs do not easily give rise to dynamic aspects in Semantic Dementia.

  8. Hypothesis In ordinary life SD-patients recognize people, because dynamic aspects of faces are available both at presentation and ”test”. They are also within the normal/supernormal range in tests like Political Faces, because the national political figures may have been studied in action carrying emotional expression, i.e. dynamic aspects.

More Related