| 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 |