Petropavlovskaia E A
I. P. Pavlov Institute of Physiology, Russian Acad. Sci., 199034, St. Petersburg, Nab. Makarova, 6, Russia.
Ross Fiziol Zh Im I M Sechenova. 2003 Jun;89(6):669-81.
Thresholds of the event-related potentials (ERPs) appearance were measured for one stationary and four moving auditory images presented in silence or under forward masking conditions. The difference between thresholds in silence and after noise masker was considered as masking level. Under the forward masking, the amplitude of the ERP to the first click in the test series decreased in guinea pig auditory cortex. Masking level decreased with the time lag between signal and masker and didn't depend on the fused auditory image localization that corresponded to the first click in different test signals. This fact can support the hypothesis that for the long test signals the initial part can be masked more than the final one. The ERPs amplitude to next clicks in test series depended on interaction of two factors: forward masking in the "masker-signal" system and interaction of separate ERPs in the series evoked by the test signal.
在安静或前掩蔽条件下，对一个静止和四个移动的听觉图像测量事件相关电位（ERP）出现的阈值。安静时的阈值与噪声掩蔽后的阈值之差被视为掩蔽水平。在前掩蔽条件下，豚鼠听觉皮层中对测试系列中第一个滴答声的ERP幅度降低。掩蔽水平随着信号与掩蔽器之间的时间延迟而降低，并且不依赖于与不同测试信号中第一个滴答声相对应的融合听觉图像定位。这一事实可以支持这样的假设，即对于长测试信号，其初始部分可能比最终部分被掩蔽得更多。测试系列中对后续滴答声的ERP幅度取决于两个因素的相互作用：“掩蔽器 - 信号”系统中的前掩蔽以及测试信号诱发的系列中单独ERP之间的相互作用。
