Structural descriptions in HIT - a problematic commitment

Humphreys and Forde conceptualize object representations as structural desc riptions, without discussing Ore implications of structural description mod els. We argue that structural description models entail two major assumptio ns - a part-structure assumption and an invariance assumption, The invarian ce assumption is highly problematic because it contradicts a large body of findings which indicate that recognition performance depends on orientation and size, We will delineate relevant findings and outline an alternative c onception.