Huis in't Veld F, Osterhammel P, Terkildsen K
Scand Audiol. 1977;6(1):27-34. doi: 10.3109/01050397709044995.
The most interesting electrode positions for recording the FFR are the Vertex and the mastoid. The response is greatest at the Vertex. At the mastoid it comes earlier and probably in a different phase. As a combined result of these relations the responses are in opposite phase with a 500 Hz stimulus, and at 400 Hz they are in-phase. The Vertex-derived response is contaminated by the Jewett waves and at the mastoid there is in addition a CM-like activity. In order to simplify the interpretation we recommend use of the Vertex only as active electrode position, with reference electrodes on the neck, which is largely neutral. A very effective stimulus is a 500 Hz tone-burst with rise-fall times of 2 msec and a plateau of 6 msec. Shorter stimuli yield a smaller response, and with longer stimulus duration, adaption becomes a problem. The Jewett wave contamination can be eliminated by means of recording the response twice with opposite stimulus polarity and subtracting the two from each other.
记录功能性频率反应（FFR）最有趣的电极位置是头顶和乳突。在头顶处反应最大。在乳突处反应出现得更早，且可能处于不同相位。由于这些关系的综合结果，对于500赫兹的刺激，反应处于相反相位，而对于400赫兹的刺激，它们处于同相。源自头顶的反应会受到朱厄特波的干扰，在乳突处还存在类似耳蜗微音电位（CM）的活动。为了简化解读，我们建议仅使用头顶作为活动电极位置，参考电极置于颈部，颈部在很大程度上是中性的。一种非常有效的刺激是一个500赫兹的短纯音，其上升和下降时间为2毫秒，平台期为6毫秒。较短的刺激会产生较小的反应，而随着刺激持续时间延长，适应性会成为一个问题。可以通过用相反的刺激极性记录两次反应并将两者相减来消除朱厄特波的干扰。
