Characterizing the cortical representation of natural sounds using distance matrices Bruno L. Giordano Institute of Neuroscience and Psychology University of Glasgow
[email protected]
12/06/2014 ‐ ICST
Distances in experimental psychology and neuroscience: (dis)similarities
1/15
Acoustics‐independent representation of natural‐ sound categories in fMRI
Group‐level correlational analysis of feature encoding in fMRI‐pattern correlations
Representational geometry of natural‐ sound categories in fMRI
Single‐subject metric analysis of category representation in fMRI‐pattern correlations
2/15
Abstract encoding of auditory objects in cortical activity patterns Giordano et al. (Cerebral Cortex, 2013)
Encoding of categories in the cortex: acoustics of abstract processing?
Speech triggers abstract processes. Is abstract processing domain general?
Are abstract sound processes implemented in anterior temporal lobe (cf., what/where model)? 3/15
Representational similarity analysis Kriegeskorte et al., (Front Sys Neurosci, 2008)
4/15
Design Stimuli Object
Living
Nonliving
Agent
Human
Nonhuman
Vocal
4
4
Nonvocal
4
4
Human
Nonhuman
8
8
Well identifiable; same duration (3 s) and RMS level
Scanning
Participants
Fast event‐related (16 blocks)
20, normal hearing right handed
Task: 1‐back repetition detection
10 males, 10 females
3T, 12‐channel head coil, voxel = 2X2X2.75 mm
non‐musicians
5/15
Acoustical dissimilarities
6/15
Category dissimilarities
7/15
RFX test of feature encoding RFX T‐test for RDM‐SDM correlation (df = 19).
RFX T‐test for RDM‐SDM partial correlation (df = 19)
Conjunction: both significant (p