Medical School, Sao Paulo University, FMUSP.
Braz J Otorhinolaryngol. 2011 Nov-Dec;77(6):686-90. doi: 10.1590/S1808-86942011000600002.
The P300 results from focusing attention on rare stimuli in the midst of other frequent stimuli; it tests recent attention and memory, both of which depend on discriminating among verbal or nonverbal stimuli.
To compare the P300 with verbal and nonverbal stimuli in normal-hearing adults.
A prospective study was made of 15 male subjects aged from 22 to 55, with no hearing complaints. The subjects underwent short and long latency (P300) auditory evoked potentials with verbal and non-verbal stimuli.
The mean P300 latency with verbal stimuli was significantly higher than the P300 with nonverbal stimuli. The P300 amplitudes were significantly lower for verbal compared with non-verbal stimuli.
There were no differences between ears with respect to P300 latencies and amplitudes for both non-verbal and verbal stimuli. Latencies were higher with verbal stimuli; amplitudes had lower values.
P300 是在其他频繁刺激中集中注意力于罕见刺激时产生的；它测试最近的注意力和记忆力，这两者都取决于区分言语或非言语刺激。
比较正常听力成年人的 P300 与言语和非言语刺激。
前瞻性研究了 15 名年龄在 22 至 55 岁之间、无听力抱怨的男性受试者。受试者接受了短潜伏期和长潜伏期（P300）听觉诱发电位，刺激包括言语和非言语刺激。
言语刺激的 P300 潜伏期明显高于非言语刺激的 P300 潜伏期。与非言语刺激相比，言语刺激的 P300 幅度明显较低。
对于非言语和言语刺激，双耳的 P300 潜伏期和幅度均无差异。言语刺激的潜伏期较高；幅度值较低。
