P300 Latency

The P300 latencies, measured as the most positive peak in the 350 to 650 msec window at Pz (Table 1), were significantly different among the six tasks (“size,”“rhyme,” lexical decision-1 (LD-1), lexical decision-2 (LD-2), lexical decision-3 (LD-3), and semantic (F5, 115) = 21.29, p< 0.001, GG □epsilon = 0.74). Post hoc Tukey-A comparison tests revealed that P300 latency was significantly shorter for the visual task (“size” decision) than for all other tasks (p< 0.01), and shorter for the LD-1 and rhyme tasks than for the semantic, LD-2, and LD-3 tasks (p□< 0.05). No other differences were significant.