TY - JOUR
T1 - Decoding what the brain 'sees' independent of what the person 'sees'
AU - Williams, Mark A.
PY - 2012
Y1 - 2012
N2 - Multi-voxel pattern analysis techniques allow us to infer what the brain encodes from neuroimaging scans. During scanning we briefly present stimuli to participants to examine neural responses to seen and unseen stimuli. We then examine the accuracy of a support vector machine to classify the stimulus category based on the pattern of neural activity. Previously we have shown patterns in particular brain regions involved in visual perception of novel objects carry information that corresponds to behavioral performance. Although the spatial pattern in both retinotopic and lateral occipital cortex (LOC) in humans contains information about the category of an object, only in the LOC is the neural pattern stronger for correct than for incorrect trials. This dissociation between early visual and higher visual areas demonstrates the way in which the brain encodes novel objects, with a particular role for LOC in determining behavioural responses. Here we examined the neural patterns to seen and unseen 'real' objects, faces and scenes. Interestingly the areas of the brain that encode these unseen stimuli include regions of the temporal lobe, much further along the processing stream than LOC. This suggests that unseen familiar stimuli are processed at a higher level than unseen novel stimuli.
AB - Multi-voxel pattern analysis techniques allow us to infer what the brain encodes from neuroimaging scans. During scanning we briefly present stimuli to participants to examine neural responses to seen and unseen stimuli. We then examine the accuracy of a support vector machine to classify the stimulus category based on the pattern of neural activity. Previously we have shown patterns in particular brain regions involved in visual perception of novel objects carry information that corresponds to behavioral performance. Although the spatial pattern in both retinotopic and lateral occipital cortex (LOC) in humans contains information about the category of an object, only in the LOC is the neural pattern stronger for correct than for incorrect trials. This dissociation between early visual and higher visual areas demonstrates the way in which the brain encodes novel objects, with a particular role for LOC in determining behavioural responses. Here we examined the neural patterns to seen and unseen 'real' objects, faces and scenes. Interestingly the areas of the brain that encode these unseen stimuli include regions of the temporal lobe, much further along the processing stream than LOC. This suggests that unseen familiar stimuli are processed at a higher level than unseen novel stimuli.
UR - https://doi.org/10.1177/1550059412444821
M3 - Meeting abstract
VL - 43
SP - 221
JO - Journal of Clinical EEG and Neuroscience : Abstracts of peer-reviewed presentations at the Australasian Cognitive Neurosciences Conference (20th meeting of the Australasian Society for Psychophysiology), November 26-29, 2010, Swinburne University of Techn
JF - Journal of Clinical EEG and Neuroscience : Abstracts of peer-reviewed presentations at the Australasian Cognitive Neurosciences Conference (20th meeting of the Australasian Society for Psychophysiology), November 26-29, 2010, Swinburne University of Techn
SN - 1550-0594
IS - 3
T2 - Australasian Cognitive Neurosciences Conference (21st : 2011)
Y2 - 9 December 2011 through 12 December 2011
ER -