psychology of whistle-blowing = psychology of what?

Context:

Back at the Presidio, Zimbardo enthusi-
astically reels off a seemingly endless list of
projects in the works. HIP has just fi nished its
fi rst study, a collaboration with researchers at
Vrije Universiteit Amsterdam in the Nether-
lands on the psychology of whistle-blowing.
In a contrived setup in which volunteers had
a chance to notify the university’s commit-
tee on human subjects of an unethical experi-
ment, only 6% blew the whistle. Now the
team is investigating what personality traits
and motivations distinguish the whistleblow-
ers. “There’s almost no research on any of
these questions,” Zimbardo says.