Point-spread function of the BOLD response across columns and cortical depth in human extra-striate cortex

Alessio Fracasso, Serge O Dumoulin, Natalia Petridou

    Research output: Contribution to journal/periodicalArticleScientificpeer-review

    11 Citations (Scopus)
    230 Downloads (Pure)

    Abstract

    Columns and layers are fundamental organizational units of the brain. Well known examples of cortical columns are the ocular dominance columns (ODCs) in primary visual cortex and the column-like stripe-based arrangement in the second visual area V2. The spatial scale of columns and layers is beyond the reach of conventional neuroimaging, but the advent of high field magnetic resonance imaging (MRI) scanners (UHF, 7 T and above) has opened the possibility to acquire data at this spatial scale, in-vivo and non-invasively in humans. The most prominent non-invasive technique to measure brain function is blood oxygen level dependent (BOLD) fMRI, measuring brain activity indirectly, via changes in hemodynamics. A key determinant of the ability of high-resolution BOLD fMRI to accurately resolve columns and layers is the point-spread function (PSF) of the BOLD response in relation to the spatial extent of neuronal activity. In this study we take advantage of the stripe-based arrangement present in visual area V2, coupled with sub-millimetre anatomical and gradient-echo BOLD (GE BOLD) acquisition at 7 T to obtain PSF estimates and along cortical depth in human participants. Results show that the BOLD PSF is maximal in the superficial part of the cortex (1.78 mm), and it decreases with increasing cortical depth (0.83 mm close to white matter).

    Original languageEnglish
    Pages (from-to)102034
    JournalProgress in Neurobiology
    Volume202
    DOIs
    Publication statusPublished - 16 Mar 2021

    Fingerprint

    Dive into the research topics of 'Point-spread function of the BOLD response across columns and cortical depth in human extra-striate cortex'. Together they form a unique fingerprint.

    Cite this