School of Psychology, University of New South Wales, Sydney, Australia.
School of Psychology, University of New South Wales, Sydney, Australia.
Neuroimage. 2021 Aug 15;237:118103. doi: 10.1016/j.neuroimage.2021.118103. Epub 2021 May 3.
Self-generated stimuli have been found to elicit a reduced sensory response compared with externally-generated stimuli. However, much of the literature has not adequately controlled for differences in the temporal predictability and temporal control of stimuli. In two experiments, we compared the N1 (and P2) components of the auditory-evoked potential to self- and externally-generated tones that differed with respect to these two factors. In Experiment 1 (n = 42), we found that increasing temporal predictability reduced N1 amplitude in a manner that may often account for the observed reduction in sensory response to self-generated sounds. We also observed that reducing temporal control over the tones resulted in a reduction in N1 amplitude. The contrasting effects of temporal predictability and temporal control on N1 amplitude meant that sensory attenuation prevailed when controlling for each. Experiment 2 (n = 38) explored the potential effect of selective attention on the results of Experiment 1 by modifying task requirements such that similar levels of attention were allocated to the visual stimuli across conditions. The results of Experiment 2 replicated those of Experiment 1, and suggested that the observed effects of temporal control and sensory attenuation were not driven by differences in attention. Given that self- and externally-generated sensations commonly differ with respect to both temporal predictability and temporal control, findings of the present study may necessitate a re-evaluation of the experimental paradigms used to study sensory attenuation.
与外部生成的刺激相比，自生成的刺激会引起感觉反应的减少。然而，许多文献并没有充分控制刺激的时间可预测性和时间控制的差异。在两项实验中，我们比较了听觉诱发电位的 N1（和 P2）成分，这些成分与这两个因素有关。在实验 1（n=42）中，我们发现增加时间可预测性以一种可能经常解释对自发生声音的感觉反应减少的方式降低了 N1 幅度。我们还观察到，减少对音调的时间控制会导致 N1 幅度减小。时间可预测性和时间控制对 N1 幅度的对比影响意味着，在控制每个因素时，感觉衰减占主导地位。实验 2（n=38）通过修改任务要求来探索选择性注意对实验 1 结果的潜在影响，使得在条件之间对视觉刺激分配类似水平的注意力。实验 2 的结果复制了实验 1 的结果，并表明观察到的时间控制和感觉衰减的影响不是由注意力的差异驱动的。鉴于自发生和外部发生的感觉通常在时间可预测性和时间控制方面都不同，本研究的发现可能需要重新评估用于研究感觉衰减的实验范式。
