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The Lewy Body Dementia Association (LBDA) clarified the distinction between the term used in the autopsy report, "diffuse Lewy body dementia"—which is more commonly called "diffuse Lewy body disease" and refers to the underlying disease process—and the umbrella term "Lewy body dementia"—which encompasses both Parkinson's disease dementia (PD) and dementia with Lewy bodies (DLB). According to LBDA spokesperson Dennis Dickson, "The report confirms he experienced depression, anxiety, and paranoia, which may occur in either Parkinson's disease or dementia with Lewy bodies... In early PD, Lewy bodies are generally limited in distribution, but in DLB, the Lewy bodies are spread widely throughout the brain, as was the case with Robin Williams." Ian G. McKeith, professor and researcher of Lewy body dementias, commented that Williams's symptoms and autopsy findings were explained by DLB.