Kim H
Department of Psychotherapy, Taegu University, Korea.
Cortex. 1994 Jun;30(2):331-41. doi: 10.1016/s0010-9452(13)80203-1.
On most, if not all, laterality tasks, some subjects initially display a left sensory field advantage and others a right sensory field advantage. During the course of testing, the mean asymmetry score of those subjects who start with a left sensory field advantage decreases, whereas the mean asymmetry score of those subjects who start with a right sensory field advantage increases (asymmetry scores computed as L-R). Some previous studies (e.g., Ross-Kossak and Turkewitz, 1986) have suggested that these differential, temporal shifts in sensory field advantage reflect systematic changes in subjects' sensory field advantage (and associated hemispheric advantage) during familiarization and individual differences in those changes. Alternatively, the differential, temporal shifts may reflect unsystematic sources of changes because they are not distinguishable from statistical regression toward the mean. Consistent with this hypothesis, "time-reversed control" analyses of laterality data show that the differential trends do not reflect a factor associated with the specific direction of time passage as would be predicted in the case of increasing stimulus familiarization. Regression of asymmetry scores toward the mean, or its equivalent, imperfect reliability of asymmetry scores, may be significantly attributable to short-term fluctuations in subjects' hemispheric arousal asymmetries.
在大多数（如果不是全部）偏向性任务中，一些受试者最初表现出左侧感觉场优势，而另一些则表现出右侧感觉场优势。在测试过程中，那些最初具有左侧感觉场优势的受试者的平均不对称分数会降低，而那些最初具有右侧感觉场优势的受试者的平均不对称分数会增加（不对称分数计算为L - R）。一些先前的研究（例如，Ross - Kossak和Turkewitz，1986）表明，这些感觉场优势在时间上的差异变化反映了受试者在熟悉过程中感觉场优势（以及相关的半球优势）的系统性变化以及这些变化中的个体差异。或者，这种在时间上的差异变化可能反映了变化的非系统性来源，因为它们与向均值的统计回归无法区分。与这一假设一致，对偏向性数据的“时间反转控制”分析表明，这些差异趋势并不反映与时间流逝的特定方向相关的因素，而在刺激熟悉度增加的情况下会有这样的预测。不对称分数向均值的回归，或者其等效情况，即不对称分数的可靠性不完善，可能很大程度上归因于受试者半球唤醒不对称的短期波动。
