Answers are grounded in this paper and cite their sources.
A second large family with a dominantly inherited benign disorder resembling the stiff-man syndrome is reported. The infants are markedly hypertonic at birth, but their tone becomes almost normal by 3 years of age. Stiffness reappears at adolescence, often precipitated by sudden movement or cold, but remains mild when compared with the sporadic disorder.
No takes yet. Share an insight, caveat, or question.
Sander et al. (1980) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: