Figure 3.

Possible scenarios for brain connectivity under the assumption of single representation and multiple representations. A picture of a brain is shown from a top view. The rectangles over parietal lobes represent a magnification of voxels in the IPS and the type of representation within them. In the case of a single representation, format-independent representation exists in the IPS (black asterisks). In such a case the communication between the left and right IPS should be independent of format (i.e., digits or dots). In this example, the activation in the right IPS modulates the activation in the contralateral IPS. In contrast, the multiple representations hypothesis predicts that if different representations exist in the IPS, the activation between both IPS should be format-dependent. In the current example, the right IPS modulates the activity in the left IPS for dots (red asterisks), but not for digits (turquoise asterisks). The current figure is only an example, and is a simplified version of possible connectivity that can occur between the hemispheres, and does not discuss possible connectivity that can occur within a hemisphere.