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. 2019 Mar 14;2:102. doi: 10.1038/s42003-019-0345-2

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — Effects of reward amount on the striatal LFP. a Comparison between the effects of reward amount and delay interval. Each point represents single site and compares the alteration in power at the low-frequency bands indicated by brackets in Fig. 5b, c. b Effects of reward amount for a broader frequency band in monkey B (n = 5 sites). The bracket indicates the frequency band used for the analysis in a. c Comparison of spectral modulation associated with interval condition (red, Long minus Short) with that associated with reward amount (black, Reward × 2 minus × 1). Data were divided into 10 groups. d Distribution of rank correlation coefficients computed for the two power spectra shown in c for individual sites in two monkeys. The black bar indicates statistically significant correlation (p < 0.05). Overall, the values were not statistically different from zero (two-tailed t-test, t₁₃ = 0.19, p = 0.85)