Table 4. OBJECT SET TRACKING.

Visual tracking and discrimination, Crawling Preference Procedure

Study	Age	Quantities Tested	Preferred Greater Numerical Quantity?	Continuous Variables Controlled?
Feigenson, Carey, & Hauser (2002)	10 and 12 mos	1 vs 2	Yes	No
Feigenson, Carey, & Hauser (2002)	10 and 12 mos	1 vs 2	No	Yes
Cheries, Mitroff, Wynn & Scholl (2008)	10-12 mos	1 vs 2	Yes, when crackers are visible	No
VanMarle & Wynn (2011) Experiment 1a	10 and 12 mos	1 v 2	Yes	No
Feigenson, Carey, & Hauser (2002)	10 and 12 mos	2 vs 3	Yes	No
Feigenson & Carey (2005)	10 and 12 mos	0 vs 4	Yes
Feigenson & Carey (2005)	10 and 12 mos	1vs 4	No	No
Feigenson, Carey, & Hauser (2002)	10 and 12 mos	2 vs 4	No	No
Feigenson, Carey, & Hauser (2002)	10 and 12 mos	3 vs 4	No	No
Feigenson, Carey, & Hauser (2002)	10 and 12 mos	3 vs 6	Yes, when crackers are visible	No
VanMarle & Wynn (2011) Experiment 1b	10-12 mos	5 v 10	Yes	No
VanMarle & Wynn (2011) Experiment 2 and 3a	10-12 mos	5 v 10	No	Yes
VanMarle & Wynn (2011) Experiment 3b	14 mos	5 v 10	Yes	No

This table is a list of relevant studies that have been conducted to investigate infants’ small number and quantity tracking using the crawling procedure. Stimuli used to test quantities for these studies are usually crackers. Column 4 indicates whether or not infants preferred the greater quantity of crackers. A Yes in the column may be interpreted as infants’ capacity to discriminate the quantities. Column 5 indicates whether continuous variables of surface area were controlled.