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By Ellen Perecman

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Other relational activities may not have this prop­ erty—for example, the relations of actor to action and action to object do not involve inclusion. The contrast between unitary and relational processing rests on differen­ tiating the kind of output of a module. This formulation resolves a conun­ drum that we would otherwise face. Clearly, recognition of a square requires computation of equal sides and angles, itself a relational activity; therefore, we might argue that no activity is unitary.

Of particular interest in the context of this chapter is the position that the half fields of visual space differentiate out of a unitary preobject space. A lesion of the right hemisphere involves and so exposes the parietal seg­ ment of the object formative process. This segment, the forming left hemifield, is normally submerged within the object as a "preprocessing" stage. According to this view, the symptoms of parietal damage do not reflect disruptions of "higher order" computations subsequent to the (conscious) perception of an object but are disruptions at a point where an object is first selected out of the egocentric space of mental imagery into a threedimensional space of objects and object relations.

Score s ar e th e mea n numbe r of errors . G r o u p s th e mean s of mal e an d femal e subjects , respondin g t o lon g an d shor t excerpts , fro m thei r unfamilia r melodies . Th e score s ar e mean s of presente d d's. * Exclude s subject s performin g at chanc e level. Score s ar e numbe r correc t (ou t of possibl e 24) on dichoti c melodie s differin g in rhythm . ^Percentag e correct , correcte d for guessing . e Bever 2. Cerebral Lateralization, Cognitive Asymmetry, and Human Consciousness 25 RELATIONAL A N D UNITARY PROCESSES IN TASKS The dominant theories about the differences between the two hemi­ spheres have evolved in several stages during recent decades.

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