Demiralp T, Yordanova J, Kolev V, Ademoglu A, Devrim M, Samar V J
Electro-Neuro-Physiology Research and Application Center, Istanbul University, Capa-Istanbul, Turkey.
Brain Lang. 1999 Jan;66(1):129-45. doi: 10.1006/brln.1998.2028.
A time-frequency decomposition was applied to the event-related potentials (ERPs) elicited in an auditory oddball condition to assess differences in cognitive information processing. Analysis in the time domain has revealed that cognitive processes are reflected by various ERP components such as N1, P2, N2, P300, and late positive complex. However, the heterogeneous nature of these components has been strongly emphasized due to simultaneously occurring processes. The wavelet transform (WT), which decomposes the signal onto the time-frequency plane, allows the time-dependent and frequency-related information in ERPs to be captured and precisely measured. A four-octave quadratic B-spline wavelet transform was applied to single-sweep ERPs recorded in an auditory oddball paradigm. Frequency components in delta, theta, and alpha ranges reflected specific aspects of cognitive information processing. Furthermore, the temporal position of these components was related to specific cognitive processes.
对听觉Oddball范式下诱发的事件相关电位（ERP）进行时频分解，以评估认知信息处理的差异。时域分析表明，认知过程由诸如N1、P2、N2、P300和晚期正复合体等各种ERP成分反映。然而，由于这些过程同时发生，这些成分的异质性被强烈强调。小波变换（WT）将信号分解到时频平面上，能够捕捉并精确测量ERP中与时间相关和与频率相关的信息。将四八度二次B样条小波变换应用于听觉Oddball范式中记录的单次扫描ERP。δ、θ和α频段的频率成分反映了认知信息处理的特定方面。此外，这些成分的时间位置与特定的认知过程相关。
