Research Article

Elicitation of the Acoustic Change Complex to Long-Duration Speech Stimuli in Four-Month-Old Infants

Table 4

Infants: mean (1SD) baseline-to-peak amplitude and peak latency measurements for individual components of the waveform elicited to the S1 and S2 portion of the /dada/, /daba/, and /daDa/ stimulus conditions are shown. The latencies were measured from the onset of the S1 stimulus and from the onset of the change in the stimulus at S2. Mean (1SD) N1-P2 amplitudes are also indicated. Mean values that represent measurements from fewer than five responses are denoted with an asterisk (). The dashed line indicates that no responses were detected. The terms “BP” and “BN” denoted “broad positive” and “broad negative” peaks, respectively.

PeakMean amplitude in µV (1SD)Mean peak latency in ms (1SD)
/dada//daba//daDa//dada//daba//daDa/

S1P15.25 (1.69)6.69 (4.22)6.19 (2.85)133 (27)139 (20)124 (15)
N1−8.03 (4.48)−9.13 (4.36)−9.30 (3.69)225 (16)230 (24)222 (28)
P27.46 (3.46)5.61 (2.67)6.56 (4.04)313 (14)319 (29)328 (55)
N2−5.81 (4.02)−7.12 (2.37)−3.37 (2.88)430 (25)432 (57)384 (44)
N1-P214.49 (6.77)14.04 (3.64)15.86 (6.21)

S2P13.99 (1.48)7.81 (3.00)9.62 (1.63)136 (25)134 (36)142 (63)
N1−6.60 (3.22)−10.05 (6.99)−7.46 (3.62)259 (48)285 (58)296 (31)
P27.97 (5.43)4.26 (2.58)6.00 (5.08)448 (69)391 (97)421 (34)
N2−4.28 (1.14)−4.09 (3.92)−3.71584 (206)492 (124)563
BP4.816.35 (1.24)577518 (32)
BN−4.92 (0.94)−10.09−5.69 (1.05)537 (159)319587 (26)
N1-P214.57 (5.48)13.69 (8.27)17.50 (10.54)