I agree about Lethe. The Neural Neutralizer got her. When she says, "I love my work," she has totally flat affect, and we hear the music cue for something's askew.
Lethe had definitely been altered by the Neural Neutralizer. Her name was derived from the river of forgetfulness in Greek mythology.
Of course. Thanks, you two; good points. The music cue - is that the slowly blowing descending horn? Used, e.g., in Return of the Archons when Landru first appears and in Wink of an Eye when Kirk notices the bridge crew "slowing down?" If so, I love that one.