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accuracy achievement activity age changes age groups Age range age trends appear Belbin Birren capacity changes with age Chapter condition correct decline demands different ages difficulty discrimination display effect effector end-stops errors evidence experiment experimental fact factors fifties figures Firstly formance forties given Hick's law identification indicated industrial involved learning less light limits Means per subject mechanism ment method morse key move movement Naval ratings normal Nuffield Foundation Number of subjects old age older subjects operations organic paced task percentage perception performance possible practice present preview problem Psychol reaction relation to age response reversed reversible perspective Schonfield scores seems sense short-term memory short-term retention shown in Fig signal similar sixties skill slowing Snellen charts speed studies stylus substantial Szafran Table tachistoscope taken target tended thirties tion trials twenties unpaced visual visual acuity Welford younger subjects