A brief glimpse into the variability of procedures used within infant eye-tracking studies.

Table 1: A brief glimpse into the variability of procedures used within infant eye-tracking studies.

Studies	Participants	Methodology	General Findings
Jones & Klin (2013) [13]	110 infants	Car seat or reclined bassinet	Decline in eye fixation in infants later diagnosed with autism spectrum disorder
	2-24 months	5-point calibration¹
		Videos of people
Lui, et al. (2011) [47]	23 infants	Car seat	Whole face stimuli showed no differences
	4-9 months	5-point calibration⁴	Over time, decreased fixation duration on internal features of other race faces
		Videos of same and other race faces
Hunnius & Geuze (2004) [33]	10 infants	Infant chair	Adapted gaze behavior to stimuli characteristics
	12-26 weeks	2-point calibration³	Direct attention to mother's eyes and mouth.
		Dynamic stimuli of mother
Hunnius, Wit, Vrins & Von Hofsten (2011) [48]	31 infants: 4 months	Parent lap	Demonstrated avoidant looking at threat based emotional expressions
	29 infants: 7 months	Parent lap
		9-point calibration⁴
		Faces of people
Frank, Vul & Saxe (2011) [44]	129 infants	Parent lap	Over time, attention directed to parts of complex scenes that are socially intriguing.
	3-30 months	2-point calibration¹
		Live action videos
Gredeback, Fikke, & Melinder (2010) [49]	40 infants	Experimenter lap	Infants followed the gaze of unfamiliar individual rather than mother
	2-8 months	2-point calibration²
		Visuals of people engaging in a task

Methodology for data analysis used: ¹MATLAB; ²Tobii Studio; ³Author designed; ⁴Not documented.