“…Of these, experimenter measurement of length as specified by Miller and Hassanein (1971) was used to calculate the PI in three studies (Als, Tronick, Adamson, & Brazelton, 1976;Goggin, Holmes, Hassanein, & Lansky, 1978;Zeskind, 1981). To our knowledge, the current study under scrutiny is the eleventh published paper showing behavioral effects related to the PI.…”