Table 1.

Pattern appearance and flash VEP parameters for normal control subjects

		Latency difference (ms) Mean (2 SD) (range)			Amplitude ratio Mean (2 SD) (range)
Stimulus	Number of subjects	Right eye	Left eye	Mean	Right eye	Left eye	Mean
Pattern appearance	27	−0.04 (1.86) (−2 to +3)	0.07 (2.05) (−2 to +2.5)	0.02 (1.86) (−0.5 to +2)	1.10 (0.50) (0.71 to 1.77)	1.01 (0.42) (0.63 to 1.59)	1.06 (0.23) (0.91 to 1.37)
Flash	11	−0.09 (2.44) (−2.0 to +2.0)	−0.73 (2.54) (−4.0 to 0)	−0.41 (1.47) (−1.5 to +1.0)	1.1 (0.52) (0.73 to 1.30)	1.1 (0.59) (0.81 to 1.63)	1.1 (0.15) (0.96 to 1.19)