Horváth János, Müller Dagmar, Weise Annekathrin, Schröger Erich
Institute for Psychology, Hungarian Academy of Sciences, Budapest, Hungary.
Neuroreport. 2010 May 12;21(7):537-41. doi: 10.1097/WNR.0b013e3283398094.
The mismatch negativity (MMN) event-related potential (ERP) is elicited by irregular sounds in a regular sound sequence. MMN depends on the length of the preceding regular stimulation: in repetitive sequences, changes following only two or three repetitions may elicit MMN. Thus, MMN builds up rapidly. Infrequent omissions in a repetitive sound sequence may also elicit an MMN-like waveform. In this study, the build-up of this omission-related ERP was investigated. Trains of two to nine tones with omissions at the penultimate stimulus positions were presented. Results showed no consistent omission-related ERP. In contrast, when omissions occurred with 9% probability among continuously presented tones, the omission-related waveform was elicited. Thus, the omission-related ERP builds up later than MMN.
失匹配负波（MMN）事件相关电位（ERP）由规则声音序列中的不规则声音诱发。MMN取决于先前规则刺激的时长：在重复序列中，仅两三次重复后的变化就可能诱发MMN。因此，MMN快速形成。重复声音序列中偶尔的遗漏也可能诱发类似MMN的波形。在本研究中，对这种与遗漏相关的ERP的形成进行了调查。呈现了两到九个音调的序列，在倒数第二个刺激位置有遗漏。结果显示没有一致的与遗漏相关的ERP。相反，当在持续呈现的音调中以9%的概率出现遗漏时，诱发了与遗漏相关的波形。因此，与遗漏相关的ERP比MMN形成得更晚。
