1. Self-Control in Chimpanzees Relates to General Intelligence
Michael J. Beran, William D. Hopkins 
Current Biology 
Volume 28, Issue 4, Pages e3 (February 2018)
DOI: /j.cub
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2. Figure 1 Performance of Each Chimpanzee in the HDT
The bars show the proportion of trials on which each chimpanzee choose the LL option. The points indicate the mean number of items obtained on those LL trials (maximum = 12).
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3. Figure 2 Relationship between PCTB Scores and HDT Performance
This is shown in terms of the percentage of choice of the LL set (left), HDT mean number of items accumulated when the LL set had been selected (center), and HDT efficiency score (right). For all inter-item transfer rates (3 s, 10 s, and 20 s), the efficiency score best predicted PCTB performance in this sample of chimpanzees.
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4. Figure 3
The Relation of Weighted Score of each PCTB Task and HDT Performance
Weighted scores were computed from the PAF analysis and the correlation coefficient value found between each task and the HDT scores at 3-s, 10-s, and 20-s delays (see Table 1).
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