Auditory evoked responses during the first year of life

Maturation of the cortical auditory evoked potential in infants and young children

“…N 1 was small in Newborns and Toddlers and larger in the Child group and Adults. Other studies have shown an age-related increase in the peak-to-peak amplitude measured between P 1 and N 1 in infants from newborn to 3 years (Barnet et al, 1975;Ohlrich and Barnet, 1972;Ohlrich et al, 1978;Shucard et al, 1987). All of these studies noted that N 1 was often absent in the waveform of young infants, which was also a feature of the toneevoked responses seen in Newborns in the present study.…”

“…The peak amplitude of P 2 increased systematically with age and was larger in Adults than in Newborns. P 2 /N 2 amplitude has been found to increase in infants 0-3 years (Barnet et al, 1975;Ohlrich and Barnet, 1972;Ohlrich et al, 1978;Shucard et al, 1987). Some studies have shown that P 2 amplitude increased with age (Kraus et al, 1993b;Oades et al, 1997), others observed no change.…”

Maturation of CAEP in infants and children: A review

“…1). Earlier peaks, P 1 and N 1 may sometimes be seen but are much less frequently evoked (Little et al, 1999;Molfese, 2000;Ohlrich and Barnet, 1972;Rapin and Graziani, 1967;Shucard et al, 1987;Weitzman and Graziani, 1968) and, when present, are small relative to P 2 and N 2 . Typically, P 2 has a peak latency around 200-250 ms and N 2 around 300-550 ms (Barnet et al, 1975;Kurtzberg et al, 1984;Little et al, 1999;Rotteveel et al, 1986;Shucard et al, 1987;Weitzman and Graziani, 1968).…”

Newborns discriminate novel from harmonic sounds: A study using magnetoencephalography

“…Repetitive auditory stimulation in sleeping human newborns elicits a positive deflection in the event-related potential (ERP), with a latency of about 200-300 ms (Ohlrich et al, 1972;Ellingson et al, 1974;Kurtzberg et al, 1984;Novak et al, 1989;Cheour et al, 1998Cheour et al, , 2002aKushnerenko et al, 2002b). Recently, several studies showed responses at similar latencies (Lengle et al, 2001;Huotilainen et al, 2003;Cheour et al, 2004;Kujala et al, 2004;Pihko et al, 2004) in recordings of evoked magnetic fields (ERFs).…”