Table 2.

Trial types used in Test Phase 3

Trial type	Description of arm contents	Example trial
Larger Total From Summed Larger Numerals	Presented two larger-value numerals with a single low-value numeral. Numeral value and the two-numeral array both were valid cues as to which arm offered the most reward	4 + 4; 2
Larger Total From Summed Smaller Numerals	Presented the largest numeral by itself and a pair of numerals in the other arm whose sum total was greater than that of the largest numeral. Numeral value was incongruent with largest possible total reward	3 + 3; 5
All Numerals Same	All numerals were the same; the only valid cue was which arm has the greater quantity of numerals in it	3; 3 + 3
Lone Numeral Larger	Presented the largest overall value as a single number; this represented a larger reward than the combined value of the two smaller numerals in the opposing arm. Numeral value was the most important cue to use to maximize reward	1 + 1; 3
Equal Sums	Presented a sum in each arm that was the same	4; 2 + 2

Correct arm in bold