Excerpt: It is not possible within the scope of this chapter to mount a full-scale philosophical defence of radical constructivism. What is possible is an attack from the radical constructivist point of view using a weapon readily adaptable to a wide range of opponents.

Open peer commentary on the target article “From Objects to Processes: A Proposal to Rewrite Radical Constructivism” by Siegfried J. Schmidt. Upshot: The aim is to show that, although Schmidt’s thesis must in most respects be warmly welcomed, there is an unexpressed implication concerning the dialogic structure of language that, when drawn out plainly, reveals a further valuable move open to the theory. I offer it therefore as a clarification of his theory with which I hope Schmidt may agree. He has already stressed the differences in understanding between one agent and another; it is because of this that, in order to communicate, agents must play without believing the mutual hypothetical projections of “truth,” “sincerity,” “objectivity,” “reference,” and other ideals of social “reality.” In the language process it is faith upon which this rests rather than blind trust. It is argued that only faith can properly take account of the risks of contingency.

This paper discusses different approaches in cognitive science and artificial intelligence research from the perspective of radical constructivism, addressing especially their relation to the biologically based theories of von Uexküll, Piaget as well as Maturana and Varela. In particular recent work in ‘New AI’ and adaptive robotics on situated and embodied intelligence is examined, and we discuss in detail the role of constructive processes as the basis of situatedness in both robots and living organisms.

Key words: adaptive robotics, artificial intelligence, embodied cognition, radical constructivism, situatedness