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Arch Pediatr Adolesc Med. 1999;153:206.

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Hurt et al¹ report that improving the home environment and improving caregiver (foster or biological) interactive skills seem to be the most substantial changes that would effect improved IQ scores. This may be facilitated by participatory matching of vocal hesitation pauses in spontaneous dialogue, a joint, mutually responsive rhythm that has prelinguistic origins. Neurobiological features are suggested by the correlation of the rate and variability in the duration of pauses (4.79 ± 2.48 per minute, 1.50 ± 0.33 seconds) (mean ± SD) with the left and right hemisphere, respectively, and the association of the reduction of blood pressure with longer, less recurrent pauses on the order of 2 seconds² that correlate with the feeling of rhythmicity.³ This hypothesis is supported by short-term laboratory experience demonstrating that adult female speech production is sufficient to influence infant's speech production occurring in the silent intervals between the adult's vocalizations (average, 3.37 seconds)² and . . . [Full Text of this Article]

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