Grammar originates in action planning, not in cognitive and sensorimotor visual systems.
While the PREDICATE(x) structure requires close coordination of subject and predicate, both represented in consciousness, the cognitive (ventral), and sensorimotor (dorsal) pathways operate in parallel. Sensorimotor information is unconscious and can contradict cognitive spatial information. A more likely origin of linguistic grammar lies in the mammalian action planning process. Neurological machinery evolved for planning of action sequences becomes applied to planning communicatory sequences.
Bridgeman
Bruce
B
Department of Psychology, University of California, Santa Cruz, CA 95064 bruceb@ucsc.edu http://psych.ucsc.edu/Faculty/bBridge.shtml.