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159 pages, Paperback
First published January 1, 1978
The linkage between tool use and speech affects several psychological functions, in particular perception, sensory-motor operations, and attention, each of which is part of a dynamic system of behavior.
Created with the help of speech, the time field for action extends both forward and backward. Future activity that can be included in an ongoing activity is represented by signs. As in the case of memory and attention, the inclusion of signs in temporal perception does not lead to a simple lengthening of the operation in time; rather, it creates the condition for the development of a single system that includes effective elements of the past, present, and future. This emerging psychological system in the child now encompasses two new functions: intentions and symbolic representation of purposeful action....New motives, socially rooted and intense, provide the child with direction.
The invention and use of signs as auxiliary means of solving a given psychological problem (to remember, compare something, report, choose, and so on) is analogous to the invention of tools in one psychological respect. The sign acts as an instrument of psychological activity in a manner analogous to the role of tools in labor.