The Mechanics of the Lone Holdout
In high-stakes criminal trials involving psychiatric affirmative defenses (such as postpartum psychosis, diminished capacity, or temporary insanity), jurors face conflicting burdens of proof. While the state argues intent from physical actions, the defense introduces psychiatric testimony on involuntary delusion.
As demonstrated in empirical legal studies (Kalven & Zeisel's Chicago Jury Project), a lone juror starting in the minority faces severe asymmetric normative pressure. Over 90% of juries that start with an initial 11-1 majority eventually conform to unanimous verdict unless the holdout's doubt threshold and resistance exceed group fatigue.