1932] Poliak: Afferent Fiber Systems, Primate Cerebral Cortex 121 



Experiment IV 



In this experiment in a similar way as in Experiments II and III, 

 one single bundle or segment of the visual radiation was interrupted 

 by a lesion in the parietal lobe. The instrument, a small Graefe's 

 knife, was plunged about two centimeters into the hemisphere through 



Fig. 12, Experiment IV. External (upper figure) and internal (lower figure) 

 face of the monkey's hemisphere showing the location and extent of the visual 

 projection area of the cerebral cortex found in this experiment (shaded area). 

 The visual area occupies the larger anterior portion of the upper half of the 

 occipital operculum behind the simian sulcus (Ss) and above the external 

 calcarine sulcus (Sos) over the lateral face of the hemisphere. Over the n^dial 

 face it stretches along the upper lip of the horizontal branch of the calcarine 

 fissure (Fcalc) and over the upper half of the occipital pole along the ascending 

 branch of the fissure. Small dotted area in the posterior portion of the superior 

 temporal convolution represents the superficial lesion through which the knife 

 was introduced into the substance of the hemisphere. (Compare figs. 75, 76.) 



the convexity of the posterior portion of the superior temporal con- 

 volution, as figure 12 shows (small coarsely dotted area). The bundle 

 of the external sagittal stratum interrupted in such a way is about 



