Murk can be described as an enfeebled fog with a personality disorder; it is more troubled than ethereal, sulking moodily over our lives at the end of the day.
I might have some sort of personality disorder. I might not have proper filters; it might be some kind of version of Asperger's meets Tourettes meets prose.
I've never been to a psychiatrist so have never gotten to the point where I could be formally diagnosed with any disorder. But I definitely have anxiety.
Memory is not particularly linear - it is associative, repetitive, subjective and porous. But the writer needs to convey disorder and dysfunction without making the novel itself disorderly or dysfunctional.
The art of the novelist is not unrelated to the illness of multiple personality disorder. It's a much milder form. But the better the book, the nearer to the padded cell you are.