Spatial attention enhances object coding in local and distributed representations of the lateral occipital complex
Guggenmos, Matthias, Thoma, V., Haynes, John-Dylan, Richardson-Klavehn, Alan, Cichy, Radoslaw Martin and Sterzer, Philipp 2015. Spatial attention enhances object coding in local and distributed representations of the lateral occipital complex. NeuroImage. 116, pp. 149-157.
|Authors||Guggenmos, Matthias, Thoma, V., Haynes, John-Dylan, Richardson-Klavehn, Alan, Cichy, Radoslaw Martin and Sterzer, Philipp|
The modulation of neural activity in visual cortex is thought to be a key mechanism of visual attention. The investigation of attentional modulation in high-level visual areas, however, is hampered by the lack of clear tuning or contrast response functions. In the present functional magnetic resonance imaging study we therefore systematically assessed how small voxel-wise biases in object preference across hundreds of voxels in the lateral occipital complex were affected when attention was directed to objects. We found that the strength of attentional modulation depended on a voxel's object preference in the absence of attention, a pattern indicative of an amplificatory mechanism. Our results show that such attentional modulation effectively increased the mutual information between voxel responses and object identity. Further, these local modulatory effects led to improved information-based object readout at the level of multi-voxel activation patterns and to an increased reproducibility of these patterns across repeated presentations. We conclude that attentional modulation enhances object coding in local and distributed object representations of the lateral occipital complex.
|Journal citation||116, pp. 149-157|
|Accepted author manuscript|
|Web address (URL)||http://dx.doi.org/10.1016/j.neuroimage.2015.04.004|
|10 Apr 2015|
|Publication process dates|
|Deposited||08 May 2015|
|Accepted||01 Apr 2015|
|Alexander von Humboldt-Stiftung|
|Copyright information||© Elsevier B.V. 2015.|
The authors Guy Middleton for assistance with rendering the object images from 3D models.
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