1 Introduction -- 1 Introduction -- A Splitting the Atom - The Break-up of the IQ -- 2 The "Scientific Approach" to Intelligence: An Overview of Its History with Special Reference to Mental Speed -- 3 Some Major Components in General Intelligence -- B Reaction and Inspection Time Measures of Intelligence -- 4 Reaction Time and Psychometric g -- 5 Intelligence and "Inspection Time" -- C The Psychophysiology of Intelligence -- 6 The Biological Basis of Intelligence Part I: Theory -- 7 The Biological Basis of Intelligence Part II: Measurement -- D Cognitive Principles and Intelligence -- 8 A Componential Interpretation of the General Factor in Human Intelligence -- 9 Is Intelligence? An Epilogue -- Author Index.