Department of Neurology, University of Lübeck, Lübeck, Germany.
Psychophysiology. 2011 Aug;48(8):1096-106. doi: 10.1111/j.1469-8986.2011.01176.x. Epub 2011 Jan 25.
When two letter streams containing two targets (T1 and T2) are presented left and right, T2 is better identified in the left hemifield. This study on 16 healthy participants used evidence from ERPs to decide whether this advantage is due to better processing in the right hemisphere or to overload of the left one. N2pc and P3 components evoked by T1 and T2 were measured, as well as the VEPs evoked by the stream of distractor stimuli. Already at the onset of the stream, these VEPs peaked earlier at the right than at the left hemisphere. N2pc was evoked earlier and P3 amplitudes were larger with left than with right T2. Previously reported side differences in T1-evoked N2pc were no longer obtained after correcting for constant hemispheric differences. The faster VEP latencies at the right hemisphere from the very beginning of the stimulus series may reflect an advantage in structuring fast sequences, which may cause the left visual-field advantage.
当左右两侧呈现包含两个目标（T1 和 T2）的两个字母流时，T2 在左视野中更容易被识别。本研究招募了 16 名健康参与者，通过 ERP 证据来判断这种优势是由于右半球处理得更好，还是由于左半球过载。测量了由 T1 和 T2 引起的 N2pc 和 P3 成分，以及由分心刺激流引起的 VEP。在刺激流开始时，这些 VEP 在右半球的峰值早于左半球。与右侧 T2 相比，左侧 T2 引起的 N2pc 更早出现，P3 振幅更大。在对恒定的半球差异进行校正后，不再得到 T1 诱发的 N2pc 的先前报道的侧差异。从刺激序列开始时，右半球更快的 VEP 潜伏期可能反映了快速序列结构的优势，这可能导致左视野优势。
