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. 2013 Oct 28;7:714. doi: 10.3389/fnhum.2013.00714

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Copyright © Kreegipuu, Kuldkepp, Sibolt, Toom, Allik and Näätänen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Stimuli and presentation of stimuli. In the oddball experiment only upward stimuli were used. In the optimum, the stimuli were also rotated by 180°. Stimuli are labeled from left to right: angry, happy, neutral, and target.