Table 7 Factor loadings (with varimax rotation) for the three cognitive variables from Amici et al.75,76.

From: Self-control has a social role in primates, but not in other mammals or birds

 

Social inhibition only

All three cognition tasks

Factors:

1

2

1

2

Social inhibition task*

0.880

0.297

0.855

0.371

Inhibition tasks †

  

0.234

0.922

Causal reasoning tasks ‡

  

0.970

− 0.055

Group size

0.211

0.919

0.154

0.899

Day journey

− 0.213

0.955

− 0.268

0.930

Diet (% fruit)

0.880

− 0.237

0.834

  0.080

Range size

0.838

 − 0.010

-0.217

0.893

Species sampled

6

6

Variance explained (%)

84.9

86.2

  1. Extraction based on λ = 1.0. Bold font indicates variables that have a strong positive load on the same factor.
  2. * from Amici et al.76.
  3. † mean of two inhibition tasks (A-not-B and delayed gratification tasks); from Amici et al.75.
  4. ‡ mean of three causal reasoning tasks (Middle cup, Plexiglass hole and Swing door); from Amici et al.75.
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