AUDITORY-EVOKED RESPONSES TO FREQUENCY-MODULATED TONES IN CHILDREN WITH SPECIFIC LANGUAGE IMPAIRMENT

Averaged cortically evoked potentials to frequency-modulated tones (+/ - 100 Hz around a center frequency of 1 kHz) were obtained from 12 chi ldren with SLI and 12 age-matched children who were normal language le arners. It was hypothesized, based on Stefanatos, Green, and Ratcliff (1989), that the children with receptive and expressive specific langu age impairment (SLI) would show very small or no measurable averaged r esponse amplitudes. Also, it was predicted that children who were norm al language learners would show large response amplitudes that were bo th significantly greater than those obtained during a stimulus control condition and greater than those obtained from the children with SLI. The prediction concerning children with SLI proved incorrect. The res ponses of the children with SLI were no different from those obtained from the normal language learners, and responses from both groups were significantly greater than those obtained in the control condition. T hese results indicate that, with respect to neural systems involved wi th selective response to auditory frequency shifts of approximately 10 0 Hz and occurring over 250 msec, children with SLI are not different from children who are normal language learners.