Norrix L W, Glattke T J
Department of Speech and Hearing Sciences, University of Arizona, Tucson 85721, USA.
J Commun Disord. 1996 May-Jun;29(3):157-82. doi: 10.1016/0021-9924(95)00019-4.
Topographic representation of brain electrical activity may be employed to provide information about excitation patterns and symmetry of responses to sensory stimulation. The present investigation describes the waveforms and topographic distribution of the auditory brainstem response (ABR) in normal-hearing and neurologically-normal women during several stimulus and recording conditions using a multiple electrode array. Acoustic stimuli were rarefaction clicks presented monaurally at five intensities. Latencies and amplitudes for the sagittal and coronal electrodes as well as the topographies of waves I, III, and V were described. Wave I, in an ipsilateral inverting reference condition, exhibited smallest amplitudes at the temporal electrode ipsilateral to the stimulated ear and maximum voltage at electrode sites contralateral to the stimulated ear. Amplitude and latency patterns of wave III were peculiar to level of stimulation, ear of stimulation and selection of inverting electrode site. Wave III maximum voltage was detected at fronto-central scalp areas contralateral to the stimulated ear. Wave V latencies and amplitudes varied across electrode site and inverting electrode position. Its topography revealed maximum positive voltage at fronto-central electrodes, slightly asymmetric in some instances. Analysis of amplitude and topographic patterns of ABR components may provide useful information to supplement that provided by conventional displays of waveforms.
脑电活动的地形图表示可用于提供有关兴奋模式和对感觉刺激反应对称性的信息。本研究描述了在几种刺激和记录条件下，使用多电极阵列对听力正常且神经系统正常的女性的听觉脑干反应（ABR）的波形和地形图分布。声刺激为单耳呈现的稀疏短声，强度有五种。描述了矢状和冠状电极的潜伏期和振幅，以及波I、III和V的地形图。在同侧反相参考条件下，波I在受刺激耳同侧的颞电极处表现出最小振幅，在受刺激耳对侧的电极部位表现出最大电压。波III的振幅和潜伏期模式因刺激水平、刺激耳和反相电极部位的选择而异。在受刺激耳对侧的额中央头皮区域检测到波III的最大电压。波V的潜伏期和振幅因电极部位和反相电极位置而异。其地形图显示额中央电极处有最大正电压，在某些情况下略有不对称。对ABR成分的振幅和地形图模式的分析可能会提供有用信息，以补充传统波形显示所提供的信息。
