Our representational analysis allowed us for the first time to distinguish between integrated vs independent representations, even if the independent spatial and temporal representations overlapped spatially.
DOI: http://dx.doi.org/10.7554/eLife.03043.016 Although temporal and spatial features were represented independently in premotor and parietal cortex (i.e., these regions showed specific activity patterns for one feature, independent of the respective other feature), spatially these representations overlapped to a certain degree, especially in caudal PMd.
Neurons involved in this representation overlapped with the known spatial cell types in the circuit, such as place cells and grid cells.
We find that in this near-planar representation, overlapping clusters tend to share similar GO terms.
However, the interpretation of the topographical pattern of this study differs to ours, in proposing a concentric organisation for frequency representation overlapping with an angular representation of modulation rate in contrast to our interpretation of a concentric organisation for modulation rate and an angular representation of frequency in core areas.
The object representations were activated one at a time, together with one of the two context representations, which overlapped by 50%, to simulate a partial difference in object presentation (e.g., objects presented by different voices in the same room).
We briefly define and study some issues regarding the geometry of graphs arising in the context of creating visual representations of overlapping sets of elements.
For regions that represent the same visual quadrant (e.g., the dorsal portions of visual areas V1, V2, and V3), it is difficult to dissociate effects due to shared eccentricity representations from overlapping receptive fields.
Two signals are considered to be W-disjoint orthogonal (WDO) if their STFT representations do not overlap [32].
The cortical representations of muscles overlap broadly (e.g. [23], [24]), and dense connectivity exists between multiple frontal motor areas [25].
