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ON THE NATURE OF AGE CHANGES IN PERFORMANCE
ON THE NATURE OF SKILL
METHODS OF STUDYING AGE CHANGES
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accuracy achievement action activity actual age groups Age range amount appear attempt become capacity carried cause changes Chapter clear compared complex condition correct course deal decline demands difficulty display effect errors evidence example expect experiment extent fact factors fall fifties figures forties further given greater hand identification important increase indicated individual industrial involved kind learning less light limits longer material means mechanism memory method move movement normal object observed obtained occur older subjects operations organic paced perception performance position possible practice present problem processes reaction reason regarded relation relatively response retention reversed rise scores seems seen sense short-term shown signal similar situation skill slowing speed substantial Table taken task tended thirties tion trials twenties whole younger