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I think the canonical HRF was first prroposed by Boynton et al 1996:

https://www.ncbi.nlm.nih.gov/m/pubmed/8753882/?i=2&from=boynton%201996%20mri

Am 05.12.2017 um 15:43 schrieb fmri2013 <[log in to unmask]>:

Hi all

from where these values in the spm_hrf were derived? for example rise at 6 seconds. Is there a reference for measuring these values? 

Thanks 

Aser


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