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. 2021 Apr 12;31(9):4220–4232. doi: 10.1093/cercor/bhab080

Figure 1 .

Figure 1

The longitudinal performance in the delayed free-choice task. (A) Task design: Marmosets foveated to a central fixation dot for 1–1.6 s to initiate the playing of a 20 s video clip. After the video, the fixation dot reappeared for 1.5–2.5 s to allow marmosets to return fixation to the center, during which two target images were shown (one was from the played video, and the other was a novel image). The animals’ choice consisted of the first saccade made after the fixation dot disappeared. After the decision period (6 s), the marmosets rested for 16 s before the next trial. (B) The behavioral performances for each marmoset: The top-left panel shows the proportion of choices to the novel target (the black dashed line highlights the 50% probability). The top-right panel shows the percentage difference in viewing time between two targets (novel–familiar) during the decision period. The black dashed line highlights the same viewing time in two targets. The bottom-left panel depicts the average reaction time of the choice saccades (ms). The bottom-right panel shows the average peak velocities of the choice saccades (deg/s). (C) Comparison of the behavioral responses across days. Behavioral data were split into two halves by the median of days for each marmoset (Day 1–5 and 6–11 for the marmoset A; Day 1–6 and 7–13 for the marmoset K; Day 1–3 and 4–6 for marmoset B). The opaque colors highlight the pooled data of later days, and transparent colors represent early day’s data. The first column depicts the relationship between the reaction time (x-axis) and the amplitude (y-axis) of the choice saccades, and the second column shows the relationship between the peak velocities (x-axis) and the amplitude (y-axis). The later-training days show significant differences in these measures between the novel and the familiar target choices (Wilcoxon rank-sum test, see detailed statistics in Supplementary Table S4). All data are presented as mean ± standard error of the mean and the statistic test *P < 0.05, **P < 0.01, ***P < 0.001, corrected.