Head's paradoxical reflex: Inflation of lungs, under ceain conditions, enhances inspiratory activity. Since inflation induces fuher inflation of lungs, the reflex is considered paradoxical. The vagal fibers mediating Head's paradoxical reflex carry information originating in receptors present in lungs. This reflex has a role in initiation of respiration at bih. Ref: Understanding Medical Physiology By R.L. Bijlani, M.D., RL Bijlani MD SM DSc (Hon Causa) FAMS, S. Manjunatha, M.D., 2010, Page 245.