Although the latency difference between stimulation and non-stimulation trials reached marginal significance at the population level ( n = 56 sites, z = -2.45, p = 0.014; two-tailed Wilcoxon signed-rank test), the difference was small, and only one of the 56 stimulation sites showed a significant effect ( p < 0.05; two-tailed Wilcoxon rank-sum test).
However, these differences did not reach statistical significance, possibly due to the small sample size (value-to-intermediate: n = 14, mean ± SD = 491 ± 209 ms; intermediate-to-choice: n = 27, mean ± SD = 497 ± 191 ms; value-to-choice: n = 8, mean ± SD = 543 ± 192 ms; value-to-intermediate vs. intermediate-to-choice: z = −0.11, p = 0.91; value-to-intermediate vs. value-to-choice: z = −0.72, p = 0.47; two-tailed Wilcoxon rank-sum test) (Supplementary Fig. 6 ).