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The Clock Drawing Test (CDT) is quite pervasive in the field of neuropsychology "quickly assess[ing] visuospatial and praxis abilities, and may determine the presence of both attention and executive dysfunctions" -- Canadian Partnership for Stroke Studies. It seems to be used the most for Dementia and Alzheimer's. (You can also watch many YouTube videos of the Clock Drawing Test being administered screening for Dementia).

Is the "Clock Drawing Test" for encephalitis assessed in the same way as screening for dementia?

I was reading Brain on Fire: My Month of Madness by Susannah Cahalan, about a woman who was diagnosed with encephalitis through this Clock Drawing Test. SPOILER ALERT:

Dr. Najjar diagnosed Cahalan using a test that involved her drawing a clock, a test normally given to people suspected of having dementia or Alzheimer's disease. Rather than drawing the clock face normally, the disease caused Cahalan to draw all of the numbers 1 through 12 on the right face of the clock, because the right side of her brain, which regulates the left side of the body, was inflamed. Najjar used this to help diagnose Cahalan and start her road to recovery. -Wikipedia link above ^^

Is the way Cahalan drew the clock different than how a person with Dementia would draw the clock?

How is the doctor able to distinguish Dementia from Encephalitis on the Clock Drawing Test?

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