Table 1.

Distribution of behavioral types does not differ between games with computers and humans

TypeRef. 1Ref. 2This studySignificance*
Conditional22 (50%)77 (55%)36 (50%)0.676
Humped6 (14%)17 (12%)7 (10%)0.667
Unclassifiable3 (7%)14 (10%)14 (19%)0.033
Free-rider13 (30%)32 (23%)15 (21%)0.624
Total44140720.156
  • * Fisher’s exact test per type, χ2 test for totals.

  • The thee negative cooperators are classified as humped and the five unconditional cooperators as unclassifiable (SI Results).