Compare Milner And Goodale's Two Visual Systems Theory

Describe Milner and Goodale’s (1995, 2008) Two Visual Systems theory, focusing on those aspects of their theory and related experimental findings which you find most interesting. Conclude with suggestions for future research that might help develop the theory further. The visual system can be described as having the function to allow us to experience the world "beyond out immediate body surface" (Goodale & Humphrey, 1998). The belief that there was only a singular visual system began to be first questioned in the 1960s. Schneider for example proposed the idea that there were two distinct visual systems that would specoalize in either identification or localication of objects. He argued that the ancient subcortical system would allow animals to localize objects. Object
For example it can be argued that the extent of DF's lesions was undermined by rejecting the possibitity that the damage might not have been completely restricted to the ventral stream (Ungerleider & Haxby, 1994). Ungerleider and Haxby argued that lesions in Brodmann's eighteenth and nineteenth area can be both dorsal and ventral. This is also extremery relevand in the case of DF due to the fact that the damage to her visual system was caused by anoxa and thus the damage would have been localised but nonetheless more diffudes than in the case with a stroke or tumor patient (Goodale ,1998). Von Karmen and Kerkhoff argued that deficits in perception of angles and axes could be related to damahe on the anterier parietal area, while deficits in estimation of position of objects would be related to posterior parietal damage. Von Karmen and Kerkhoff came up with these findings agter having tested 67 patients with parietal focal lesions. These findings imply that while it is true that damage to the dorsal stream can cause visual-spatoal and visual-motor deficits the damage cannot be fully explained by the effects. (Von Karmen & Kerkhoff,