Surface forms of coding
The concept of coding is central to the argument of this book. Coding implies an active experimental subject, who transforms the nominal into the functional stimulus. Chapters 2 and 3 provide an account in some detail of the evidence which supports the hypothesis that such coding occurs. Different forms or types of coding are distinguished; they are arranged in the chapters in a sequence from apparently lesser to apparently greater complexity of coding operations. This arrangement is not based on substantial evidence in detail, although, as will be seen in Chapter 4, coding on the basis of physical features of the stimulus may be less effective than coding on the basis of meaning. Little theoretical argument is included in Chapters 2 and 3; their function is to review evidence. Reference back to these chapters will occur frequently in later chapters, where research described in them will be cited in support of the coding approach. The order of Chapters 2 and 3 carries no implications about surface forms of coding occurring before deeper forms of coding, or being in any sense more basic or 'scienrific' .