Self-Control in Chimpanzees Relates to General Intelligence Michael J. Beran, William D. Hopkins  Current Biology  Volume 28, Issue 4, Pages 574-579.e3 (February 2018) DOI: 10.1016/j.cub.2017.12.043 Copyright © 2017 Elsevier Ltd Terms and Conditions

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). Current Biology 2018 28, 574-579.e3DOI: (10.1016/j.cub.2017.12.043) Copyright © 2017 Elsevier Ltd Terms and Conditions

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. Current Biology 2018 28, 574-579.e3DOI: (10.1016/j.cub.2017.12.043) Copyright © 2017 Elsevier Ltd Terms and Conditions

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). Current Biology 2018 28, 574-579.e3DOI: (10.1016/j.cub.2017.12.043) Copyright © 2017 Elsevier Ltd Terms and Conditions