An [28,45] parietal cortex. The latter cortex has in fact been subdivided on the basis of the preferred type of motion [28], but, in the absence of detailed retinotopic mapping, we cannot be certain of which subdivision to allocate our activity to within the parietal cortex. On the basis of MNI Lumicitabine biological activity coordinates, we would place it as lying closest to IPS3. That areas outside of V3A and V3B should have lower concentrations of directionally selective cells and be less responsive to simple planar motion than V5 implies, of course, that the preference for particular kinetic configurations may be dictated by a relatively small proportion of cells within it. This would not be surprising. Based on their studies of V5, Shadlen Newsome [46] estimated that 100 neurons may be the fundamental signalling units of the cortex. This, and the fact that parts of the V5 complex may be more responsive to coherent and others to incoherent motion [23], points to the need for more detailed future studies using techniques such as multi-voxel pattern analysis, which would allow us to determine whether such cells form groupings within areas V5 and V3A/B. It is difficult to predict from what little is known about the characteristics of motion-selective cells in the activated areas (apart from V5) if there are any particular patterns of moving dots, between coherently moving ones at one end and incoherently moving ones at the other, that are more effective in activating areas containing directionally selective cells than other patterns and, if so, whether they are also the ones that are preferred by human subjects. The notion that such cortical areas might have evolved in response to, and in preference for, particular patterns of motion such as optical flow or Torin 1 msds biological motion is plausible; this in turn makes it plausible to suppose that the preferred patterns would not only evoke greater activity in V5 and other cortical areas with directionally selective cells, but also lead to the patterns themselves being preferred subjectively.rsob.royalsocietypublishing.org Open Biol 2:5.2. Preferred kinetic patterns and physical characteristicsIn this study, we have shown that, of the visual areas that contain directionally selective cells and respond strongly to visual motion, certain kinetic patterns with definable characteristics, and which are subjectively preferred, evoke more powerful activity only in V5, the areas of the V3 complex and in the parietal cortex, compared with patterns with other definable characteristics or ones lacking them. There are two important issues to address in this context: one is that the recorded subjective preference and the observed accompanying stronger cortical activation in the V3 complex, in V5 and in the parietal cortex are related to preference and not to physical characteristics of the stimulus. The subject who preferred pattern 4 and thus differed from the majority also showed a correlation of cortical activity with subjective preference, even though his preferred kinetic pattern had different physical characteristics from the ones preferred by the majority. As well, another subject who had rated all the stimuli, with their different characteristics, equally had no parametric relation between cortical activity anddeclared preference. Although all but two of the patterns had some element of grouping of the kinetic dots, which may have suggested objects to some subjects, these groupings differed in size and the extent of the screen occu.An [28,45] parietal cortex. The latter cortex has in fact been subdivided on the basis of the preferred type of motion [28], but, in the absence of detailed retinotopic mapping, we cannot be certain of which subdivision to allocate our activity to within the parietal cortex. On the basis of MNI coordinates, we would place it as lying closest to IPS3. That areas outside of V3A and V3B should have lower concentrations of directionally selective cells and be less responsive to simple planar motion than V5 implies, of course, that the preference for particular kinetic configurations may be dictated by a relatively small proportion of cells within it. This would not be surprising. Based on their studies of V5, Shadlen Newsome [46] estimated that 100 neurons may be the fundamental signalling units of the cortex. This, and the fact that parts of the V5 complex may be more responsive to coherent and others to incoherent motion [23], points to the need for more detailed future studies using techniques such as multi-voxel pattern analysis, which would allow us to determine whether such cells form groupings within areas V5 and V3A/B. It is difficult to predict from what little is known about the characteristics of motion-selective cells in the activated areas (apart from V5) if there are any particular patterns of moving dots, between coherently moving ones at one end and incoherently moving ones at the other, that are more effective in activating areas containing directionally selective cells than other patterns and, if so, whether they are also the ones that are preferred by human subjects. The notion that such cortical areas might have evolved in response to, and in preference for, particular patterns of motion such as optical flow or biological motion is plausible; this in turn makes it plausible to suppose that the preferred patterns would not only evoke greater activity in V5 and other cortical areas with directionally selective cells, but also lead to the patterns themselves being preferred subjectively.rsob.royalsocietypublishing.org Open Biol 2:5.2. Preferred kinetic patterns and physical characteristicsIn this study, we have shown that, of the visual areas that contain directionally selective cells and respond strongly to visual motion, certain kinetic patterns with definable characteristics, and which are subjectively preferred, evoke more powerful activity only in V5, the areas of the V3 complex and in the parietal cortex, compared with patterns with other definable characteristics or ones lacking them. There are two important issues to address in this context: one is that the recorded subjective preference and the observed accompanying stronger cortical activation in the V3 complex, in V5 and in the parietal cortex are related to preference and not to physical characteristics of the stimulus. The subject who preferred pattern 4 and thus differed from the majority also showed a correlation of cortical activity with subjective preference, even though his preferred kinetic pattern had different physical characteristics from the ones preferred by the majority. As well, another subject who had rated all the stimuli, with their different characteristics, equally had no parametric relation between cortical activity anddeclared preference. Although all but two of the patterns had some element of grouping of the kinetic dots, which may have suggested objects to some subjects, these groupings differed in size and the extent of the screen occu.
