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. 2021 Jul 14;41(28):6116–6127. doi: 10.1523/JNEUROSCI.2879-20.2021

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Copyright © 2021 Milne et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license, which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.

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Figure 1. — Stimuli used in experiment 1. Stimuli were sequences of contiguous tone pips (50 ms) with frequencies drawn from a pool of 20 fixed values. The tone pips were arranged according to frequency patterns, generated anew for each subject and on each trial. REG sequences were generated by randomly selecting 5 (REG5), 10 (REG10), or 15 (REG15) frequencies from the pool and iterating that sequence to create a regular repeating pattern. A, Example of a spectrogram for REG5, dotted lines indicate the first three cycles. RAND sequences were generated by randomly sampling 5 (RAND5), 10 (RAND10), or 15 (RAND15) frequencies with replacement. B, Example of a spectrogram for RAND10_. A subset of trials were target trials containing a gap generated by the removal of two (REG) or three (RAND) tones, indicated by the dark blue band in the spectrogram.