Reports on connectionist models that simulated the formation of global-level and basic-level representations in young infants; revealed a global-to-basic order of category emergence; uncovered formation of two global-level representations--initial "self-organizing" perceptual level and subsequent "trained," non-perceptual level; and displayed gradual transition from perceptual global-level to perceptual basic-level representation with increasing exposure to training stimuli. (EV)