ABSTRACT
For the high-com prehension group, the P I 00 displayed a left-greater-than-right asymmetry, which was consistent with the left-hemisphere asymmetry previously reported for 20-m onth-olds (M ills et al., 1993). In contrast, the P I00 am plitude was symmetrical for the low-comprehension group. The latency o f the N200 to com prehended words was earlier for the high than for the low com prehenders. Indeed, for the high com prehenders it was the same as previously reported for the 20-montholds (197 ms). In addition, a marked difference between the groups was in the distribution of the N200 and N350 responsiveness to com prehended versus un known words. W hereas the low com prehenders displayed differences between known and unknown words over all sites within both hemispheres, word differences in the high com prehenders occurred over frontal, anterior temporal, temporal, and left parietal regions but were absent over right parietal and both occipital regions.
