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. 2021 Mar 10;15:615584. doi: 10.3389/fnhum.2021.615584

FIGURE 2.

FIGURE 2

Effects of age on HMRT strategy. Mean and standard error of the inverse efficiency score (IES) for the back-of-hand condition (A) and palm picture condition (B) of the HMRT. (A) In the back-hand condition, a medial–lateral effect was observed in the Long performance (lower-skill) group within middle-age [t(22) = 3.461, p = 0.002] and in the Medium and Long groups within elderly age [Medium, t(23) = 2.279, p = 0.032; Long, t(24) = 3.751, and p = 0.001] groups. Thus, the entire young group [t(41) = 1.288, p = 0.205] and higher-level performance groups (Short, Medium) within the older age groups [middle-age, Short, t(22) = 0.621, p = 0.541, Medium, t(21) = 1.422, p = 0.17; elderly, Short, t(24) = 1.722, p = 0.098] appeared to use the VI strategy in this task condition. (B) In contrast, all performance groups within all age groups demonstrated a medial–lateral effect in the palm picture condition, indicating use of the MI strategy. young, Short, t(13) = 6.673, p < 0.001, Medium, t(13) = 5.345, p < 0.001, Long, t(13) = 9.032, p < 0.001; middle-age, Short, t(22) = 5.718, p < 0.001, Medium, t(21) = 5.837, p < 0.001, Long, t(22) = 7.976, p < 0.001; elderly, Short, t(24) = 5.513, p < 0.001, Medium, t(23) = 5.211, p < 0.001, Long, t(24) = 6.521, p < 0.001). *p < 0.05; ***p < 0.001; n.s., not significant.