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Electrophysiological Evidence for Sentence Comprehension - Wings

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A small negative deflection on the left frontal electrodes (F3, FC3) followed by a slow<br />

positive wave over the central and parietal electrodes can be seen. The negative wave on<br />

the frontal electrodes with the left hemisphere maximum can be better seen on Figure 16,<br />

over the F3 and Fz electrodes. The left frontal distribution and the latency correspond to<br />

the Left Anterior Negativity (LAN) component (Münte et al., 1993, Osterhout &<br />

Holcomb, 1992) The peak was measured with the NeuroScan peak detection algorithm<br />

(part of Edit off-line analysis toolkit) and had a latency of 327 ms.<br />

Figure 16. LAN effect in the ‘case’ experiment (F3 and Fz electrodes)<br />

Statistical significance was tested in the 220 – 420 ms interval. Table 5 shows the<br />

statistically significant results obtained at the left frontal electrode sites. The results <strong>for</strong><br />

all electrodes are given in the Appendix.<br />

89

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