“…However, several studies showed that movement durations lengthened more in older than in young participants as ID increased (Haaland, Harrington, & Grice, 1993;Ketcham et al, 2002;Rey-Robert et al, 2012;Teeken et al, 1996;Temprado et al, 2013;Welford, Norris, & Shock, 1969;York & Biederman, 1990). As a consequence, the slope of Fitts' law is generally smaller in young than in older adults (Rey-Robert et al, 2012;Sleimen-Malkoun et al, 2013;Temprado et al, 2013). Previous studies found that, compared to increasing movement accuracy (W manipulation), increasing movement amplitude (D manipulation) results in a steeper ID-MT slope (Sleimen-Malkoun, Temprado, Huys, Jirsa, & Berton, 2012;Temprado et al, 2013).…”