Full Idea
In the simplest Turing-machine version of functionalism (Putnam 1967), mental states are identified with the total Turing-machine state, involving a machine table and its inputs and outputs.
Gist of Idea
Simple machine-functionalism says mind just is a Turing machine
Source
Ned Block (Troubles with Functionalism [1978], p. 70)
Book Reference
'The Philosophy of Mind', ed/tr. Beakley,B /Ludlow P [MIT 1992], p.70
A Reaction
This obviously invites the question of why mental states would be conscious and phenomenal, given that modern computers are devoid of same, despite being classy Turing machines.