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

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Presentation on theme: "Paradoxical Prosopagnosia in Semantic Dementia Sven-Erik Fernaeus, Per Östberg, Lars-Olof Wahlund, Nenad Bogdanovic NEUROTEC Karolinska Institutet."— Presentation transcript:

1 Paradoxical Prosopagnosia in 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 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 1.Temporal dimension (WM, recent memory, etc. & primacy-recency) 2.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 1.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. 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. 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.


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