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. 2020 Jun 16;11:1342. doi: 10.3389/fpsyg.2020.01342

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Copyright © 2020 Ogawa and Motoyoshi.

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) and the copyright owner(s) 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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Examples of stimuli and their Fourier spectra used in Experiment 1. (A) Band-pass noise with spatial frequency bandwidth of 1 octave (upper), 3 (middle) octave, and unfiltered noise (lower). Each column shows stimuli with different orientation bandwidth. (B) 1/f noise with various spectral slope.