Laser Evoked Potentials in Early and Presymptomatic Huntington’s Disease

Figure 2

The N1 (a), N2 (b), and P2 (c) latency values are shown for single PHD (presymptomatic HD) cases and N (normal) and HD groups (95% CI). The values are corrected for age. The numbers following the PHD title expressed the expected time of illness onset (in years). Only the PHD21 case, who was an 18-year-old girl, showed values in the lower normal limits. The cases PHD1, PHD2, and PHD3 with a risk for manifest chorea within little time presented with P2 latency in the upper normal limits. The case PHD1 showed significant prolongation of N2 latency. The case PHD2 had significant prolongation of N1 latency.

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(b)

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