(no subject)

[fandaal]

Finally, as noted in the introduction, some of the major recent
theories in the field of perceptual classification posit that multiple
cognitive systems underlie the representation of categories. For
example, according to Ashby et al.’s (1998) COVIS (competition
between verbal and implicit systems) model, there are separate
explicit (verbal, rule-based) and implicit (procedural) systems. The
implicit system dominates in situations in which no salient verbal
rule is available for classification, such as the present experiments.
As suggested by Ashby and Waldron (1999), a striatal pattern
classifier might underlie the implicit procedural-learning system.
The general idea in this neuropsychological model is that individual
stimuli are represented in a perceptual space in high-level
visual areas. However, a low-resolution map of this perceptual
space is then represented among striatal units. The striatal units
learn to associate category labels with different regions of perceptual
space.