Increased temporal blood flow associated with visual hallucinations in Parkinson's disease with dementia

2008 ◽  
Vol 23 (3) ◽  
pp. 464-465 ◽  
Author(s):  
Hiroshi Kataoka ◽  
Yoshiko Furiya ◽  
Masami Morikawa ◽  
Satoshi Ueno ◽  
Makoto Inoue
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Blood Flow ◽  
Visual Hallucinations ◽  
Parkinson’S Disease With Dementia

Frontal and associative visual areas related to visual hallucinations in dementia with Lewy bodies and Parkinson's disease with dementia

2010 ◽  
Vol 25 (5) ◽  
pp. 615-622 ◽  
Author(s):  
Cristina Sanchez-Castaneda ◽  
Ramon Rene ◽  
Blanca Ramirez-Ruiz ◽  
Jaume Campdelacreu ◽  
Jordi Gascon ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Dementia With Lewy Bodies ◽  
Lewy Bodies ◽  
Visual Hallucinations ◽  
Visual Areas ◽  
Parkinson’S Disease With Dementia

scholarly journals Exploring Bottom-Up Visual Processing and Visual Hallucinations in Parkinson's Disease With Dementia

2021 ◽  
Vol 11 ◽  
Author(s):  
Nicholas Murphy ◽  
Alison Killen ◽  
Rajnish Kumar Gupta ◽  
Sara Graziadio ◽  
Lynn Rochester ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Visual System ◽  
Visual Processing ◽  
Pattern Reversal ◽  
Common Symptom ◽  
Visual Hallucinations ◽  
Bottom Up ◽  
Parkinson’S Disease With Dementia ◽  
System Physiology

Visual hallucinations (VH) are a common symptom of Parkinson's disease with dementia (PDD), affecting up to 65% of cases. Integrative models of their etiology posit that a decline in executive control of the visuo-perceptual system is a primary mechanism of VH generation. The role of bottom-up processing in the manifestation of VH in this condition is still not clear although visual evoked potential (VEP) differences have been associated with VH at an earlier stage of PD. Here we compared the amplitude and latency pattern reversal VEPs in healthy controls (n = 21) and PDD patients (n = 34) with a range of VH severities. PDD patients showed increased N2 latency relative to controls, but no significant differences in VEP measures were found for patients reporting complex VH (CVH) (n = 17) compared to those without VH. Our VEP findings support previous reports of declining visual system physiology in PDD and some evidence of visual system differences between patients with and without VH. However, we did not replicate previous findings of a major relationships between the integrity of the visual pathway and VH.

scholarly journals Exploring Bottom-Up Visual Processing and Visual Hallucinations in Parkinson’s Disease with Dementia

2020 ◽  
Author(s):  
Nicholas Murphy ◽  
Alison Killen ◽  
Sara Graziadio ◽  
Lynn Rochester ◽  
Michael Firbank ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Executive Control ◽  
Visual Processing ◽  
Common Symptom ◽  
Visual Hallucinations ◽  
Bottom Up ◽  
Parkinson’S Disease With Dementia ◽  
System Physiology

AbstractVisual hallucinations (VH) are a common symptom of Parkinson’s disease with dementia (PDD), affecting up to 65% of cases. Integrative models of their etiology posit that a decline in executive control of the visuo-perceptual system is a primary mechanism of VH generation. The role of bottom-up processing in the manifestation of VH in this condition is still not clear. Here we compared amplitude and latency patterns of reversal visual evoked potentials (VEPs) in healthy controls (n=21) and PDD patients (n = 34) with a range of VH severities. PDD patients showed increased N2 latency relative to controls, but patients reporting complex VH (n=17) did not demonstrate any relationship between VEP measurements and their hallucination severity as measured on the neuropsychiatric inventory hallucinations subscale (NPIHal) score. Our VEP findings support previous reports of declining visual system physiology in PDD. However, no notable major relationships between the integrity of the visual pathway and VH were found.

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