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https://github.com/bids-apps/hyperalignment

Hyperalignment is a functional alignment method that aligns subjects' brain data in a high-dimensional space of voxels/features.
https://github.com/bids-apps/hyperalignment

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Hyperalignment is a functional alignment method that aligns subjects' brain data in a high-dimensional space of voxels/features.

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## Hyperalignment BIDS App (WiP)



### Description



Hyperalignment is a functional alignment method that aligns subjects' brain data in a

high-dimensional space of voxels/features. We showed that this alignment aligns subjects

at a fine-scale affording between-subject decoding and encoding

[Guntupalli et al. 2016](http://cercor.oxfordjournals.org/content/26/6/2919). This app runs searchlight

hyperalignment, which runs hyperalignment in multiple searchlights across the whole brain and

aggregates them into a single transformation per subject.

For now, many parameters such as searchlight size, sparsity of centers, etc., are fixed.

Please use PyMVPA to modify these and other parameters for your use case.



### Documentation



For a detailed documentation and examples, please see:

Hyperalignment in a ROI:

http://www.pymvpa.org/generated/mvpa2.algorithms.hyperalignment.Hyperalignment.html

Searchlight Hyperalignment:

https://github.com/PyMVPA/PyMVPA/blob/master/mvpa2/algorithms/searchlight_hyperalignment.py

Example in PyMVPA:

http://www.pymvpa.org/examples/hyperalignment.html



### Acknowledgements



If you use this in your project, please cite [Guntupalli et al. 2016](http://cercor.oxfordjournals.org/content/26/6/2919).



### Report Bugs/Issues



Please use PyMVPA on github to report any bugs/issues or to contribute:

https://github.com/PyMVPA/PyMVPA



### Usage



		usage: run.py [-h]

		              [--participant_label PARTICIPANT_LABEL [PARTICIPANT_LABEL ...]

		              --task TASK_LABEL --run RUN_LABEL]

		              bids_dir output_dir {participant,group}



		Example BIDS App entrypoint script.



		positional arguments:

		  bids_dir              The directory with the input dataset formatted

		                        according to the BIDS standard.

		  output_dir            The directory where the output files should be stored.

		                        If you are running group level analysis this folder

		                        should be prepopulated with the results of

		                        theparticipant level analysis.

		  {participant,group}   Level of the analysis that will be performed. Multiple

		                        participant level analyses can be run independently

		                        (in parallel).



		optional arguments:

		  -h, --help            show this help message and exit

		  --participant_label PARTICIPANT_LABEL [PARTICIPANT_LABEL ...]

		                        The label(s) of the participant(s) that should be

		                        analyzed. The label corresponds to

		                        sub- from the BIDS spec (so it does

		                        not include "sub-"). If this parameter is not provided

		                        all subjects should be analyzed. Multiple participants

		                        can be specified with a space separated list.

		  --task TASK_LABEL     Name of the task that should be used for hyperalignment.

		                        This correspnds to task- from the BIDS spec

		                        (so it does not include "task-").

		  --run RUN_LABEL       Name of the run that should be used for hyperalignment.

		                        This correspnds to run- from the BIDS spec

		                        (so it does not include "run-").



Participant level mode prepares the data for hyperalignment.

For now, it loads the data from nifti image into PyMVPA readable datasets after applying

brain mask. In future, this will be modified to compute individual subject connectomes.



    docker run -i --rm \

        -v /Users/swaroop/ds005-deriv/derivatives:/bids_dataset \

        -v /Users/swaroop/outputs:/outputs \

        bids/hyperalignment \

        /bids_dataset /outputs participant \

        --task mixedgamblestask --run 01 --participant_label 01



After running participant level (potentially in parallel), group level analysis

runs hyperalignment and saves transformation parameters.



    docker run -i --rm -v \

        /Users/swaroop/ds005-deriv/derivatives:/bids_dataset \

        -v /Users/swaroop/outputs:/outputs \

        bids/hyperalignment \

        /bids_dataset /outputs group



### Special requirements



Hyperalignment works on preprocessed data with all the subjects' data aligned to the same template.



### Relevant references



1. Guntupalli, J. S., Hanke, M., Halchenko, Y. O., Connolly, A. C., Ramadge, P. J. & Haxby, J. V. (2016). A Model of Representational Spaces in Human Cortex. Cerebral Cortex.

    DOI: http://dx.doi.org/10.1093/cercor/bhw068

2. Haxby, J. V., Guntupalli, J. S., Connolly, A. C., Halchenko, Y. O., Conroy, B. R., Gobbini, M. I., Hanke, M. & Ramadge, P. J. (2011). A Common, High-Dimensional Model of the Representational Space in Human Ventral Temporal Cortex. Neuron, 72, 404–416.

    DOI: http://dx.doi.org/10.1016/j.neuron.2011.08.026