Table 2.

Descriptive statistics for performance on gazing behavior variables as a function of condition

	Down syndrome		Williams syndrome
Measure	Median	Range	Median	Range
	Joyful condition		Joyful condition
Rate of looks+	10.67	3.28 – 19.89	6.72	0.00 – 18.86
Duration of longest look (in sec.)	2.25	0.58 – 6.62	4.13	0.68 – 13.17
	Fearful condition		Fearful condition
Rate of looks+	9.98	3.14 – 18.00	7.54	0.00 – 13.36
Duration of longest look (in sec.)	2.68	1.23 – 11.54	4.33	0.91 – 8.67

⁺Number of looks between experimenter and stimulus per minute.