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Conditional understood as the material conditional. The predicate "x is hungry" can then be defined in the following fashion: (D4) x is hungry at time t = df if x is given food at time t, then x eats that food by time t*; where t* equals t plus some suitable (specific) interval, permitting time for that behavior to be displayed. The promise of this approach in offering a satisfactory solution to these problems of meaning and significance was so great that it became a cornerstone for the position that is known as behaviorism, which endeavors to eliminate appeals to unobservables by strict adherence to this methodology [see, for example, Block (1980)].
Artificial Intelligence: Its Scope and Limits by J.H. Fetzer