用85％500Hz短声与15％1000Hz短声组成的奇异方案，在家兔头颅记录到一系列听觉诱发电位N34、P55、N96、P160、N200、P240、N300和P380单音调刺激一般记录不到N300和P380同时P240延长为P270在海马记录的P300和P380，与头颅记录的N300、P380潜伏期相同而极性相反．认为P240相当于人的P3a，P380相当于人的P3bP380不能脱离P340而单独存在，而P240可以脱离P380而存在。海马可能是P380的起源，而P240另有起源。 A series of singular regimens consisting of 85% of 500Hz short beats and 15% of 1000Hz short beats were recorded in a rabbit head to record a series of auditory evoked potentials N34, P55, N96, P160, N200, P240, N300 and P380. P300 and P380 of N300 and P380 with P240 prolonged to P270 in the hippocampus were the same as those of the head recorded N300 and P380 but opposite in polarity. It is considered that P240 is equivalent to human P3a, P380 is equivalent to human P3bP380 can not exist independently from P340, and P240 can exist from P380. The hippocampus may be the origin of P380, while P240 has another origin.