First line of the paper: > Direct control of the pupillary musculature is deemed impossible (Loewenfeld, 1993). Also, from the abstract, they tested to rule o

First line of the paper: > Direct control of the pupillary musculature is deemed impossible (Loewenfeld, 1993). Also, from the abstract, they tested to rule out "increases in arousal by increased mental effort". This is a different phenomenon than what you are discussing.