Abram Amsel

Two tests of the Sheffield hypothesis concerning resistance to extinction, partial reinforcement, and distribution of practice

Motivational properties of frustration. III. Relation of frustration effect to antedating goal factors.

Selective association and the anticipatory goal response mechanism as explanatory concepts in learning theory.

The combination of a primary appetitional need with primary and secondary emotionally derived needs.

Anxiety-produced interference in serial rote learning with observations on rote learning after partial frontal lobectomy.

Within-subject demonstration of a relationship between frustration and magnitude of reward in a differential magnitude of reward discrimination

Frustration theory and partial reinforcement effects: the acquisition-extinction paradox.

Extinction following partial delay of reward with immediate continuous reward interpolated, at 24-hour intertrial intervals.

Effect of interpolated extinction on the reacquisition of partially and continuously rewarded responses

Frustrative factors in selective learning with reward and nonreward as discriminanda.