Table 1.

Descriptive statistics of choice trials in the 2AFC task stages

	First 2AFC				Second 2AFC				Paired-samples t test	p
	Average number	SD__an	Mean difference	SD__md	Average number	SD__an	Mean difference	SD__md	Paired-samples t test	p
Difficult^{^a}	38.69	3.92	0.003	0.01	39.07	4.13	0.003	0.02	t₍₇₉₎ = −0.77	0.88
Easy^{^b}	19.64	1.44	2.26	1.05	19.60	0.97	2.29	1.04	t₍₃₉₎ = −0.78	0.88

This table represents the descriptive statistics after choice trial deletion. Average number, Mean number of choice trials across participants; Mean difference, average valuation difference of items within each choice pair across participants; SD__an, SD for the average number of choice trials; SD__md, SD for mean of valuation difference of items within a choice pair.
↵^aChoice trials that contained pairs with a valuation differential of >1 SD of the individual's mean valuation differential were not considered for further analysis.
↵^bChoice trials that contained pairs with a valuation differential of <1 SD of the individual's mean valuation differential were not considered for further analysis.