Table 1: Target discrimination, mean response times, and mean number of trials for each age group.

Age (years)Target discrimination ( 𝑑 ) (SD)Mean response times (ms) (SD)Mean no. of trials per level (SD)

62.19 (0.80)1341 (411)10.97 (2.43)
72.58 (0.73)1265 (403)10.31 (3.61)
82.91 (0.46)1085 (319)8.41 (1.27)
92.85 (0.68)1003 (302)8.54 (2.62)
102.98 (0.77)948 (293)8.21 (1.92)

Total2.72 (0.72)1121 (367)9.19 (2.57)