W-A-H,
My blank slate experience was, as Facebook status choices say, complicated.
This therapist was a Karen Horney school trained analyst, and 98 percent of the time was blank slate.

After scornful bully co-therapists and a syrupy mother-figure know-it-all, I mostly appreciated the therapist as a pleasant blank slate. She still communicated empathy and her few well-chosen words were actually pretty smart. Her scant responses didn't bother me because I understand this was the rule. I never thought her intrusive or doing a power trip with me.

However I took the thrice weekly sessions into obsession and madness. I literally was near-hallucinating, like I was on a chemical free drug trip. I saw God and signs and omens in everything. I felt in touch with the universe. From reading, this might be termed a spiritual emergence or emergency.

Unfortunately this brain trip did nothing to improve my on-planet functioning, and I lost several important friends during my hallucinatory phase. When I see a street-corner schizophrenic thinking he's the messiah I feel I understand him though.