Pratt H, Bleich N
Evoked Potentials Laboratory, Faculty of Medicine, Technion, Israel Institute of Technology, Haifa.
Hear Res. 1989 Nov;42(2-3):119-27. doi: 10.1016/0378-5955(89)90138-x.
Three-channel Lissajous' trajectories (3CLTs) of the auditory brain-stem evoked potentials (ABEP) were recorded from 16 adult subjects (28 ears) in response to rarefaction (R), condensation (C) and alternating polarity (A) clicks. 3CLTs were analysed and described in terms of their geometrical measures. All 3CLTs included 5 planar segments (named 'a', 'b', 'c', 'd' and 'e') whose latencies, durations, orientations, sizes and shapes were not affected by click polarity. Occasionally, planar segment 'd' was not defined, and its absence was parallelled by the absence of peak IV in the Vertex-Mastoid records. A small (0.03 microV), but significant increase was found in the trajectory amplitude of planar segment 'e' in C clicks. The effects of click polarity on 3CLT observed in this study suggest that some previously described ABEP changes with click polarity were the result of interactions between electrode positions and relative contributions of overlapping generators. The effects on the fourth and fifth ABEP components may be the results of changes in the temporal overlap of the activity of their generators.
对16名成年受试者（28只耳）记录了听性脑干诱发电位（ABEP）的三通道李萨如图形轨迹（3CLT），以响应疏波（R）、密波（C）和交替极性（A）短声。根据其几何测量对3CLT进行了分析和描述。所有3CLT均包括5个平面段（命名为“a”、“b”、“c”、“d”和“e”），其潜伏期、持续时间、方向、大小和形状不受短声极性影响。偶尔，平面段“d”未定义，其缺失与顶点-乳突记录中IV波峰的缺失平行。在密波短声中发现平面段“e”的轨迹幅度有小幅度（0.03微伏）但显著的增加。本研究中观察到的短声极性对3CLT的影响表明，一些先前描述的ABEP随短声极性的变化是电极位置与重叠发生器相对贡献之间相互作用的结果。对ABEP第四和第五成分的影响可能是其发生器活动时间重叠变化的结果。
