<p>The BOLD response is used in fMRI to provide a quantified measure of activation: <a href="https://en.wikipedia.org/wiki/Haemodynamic_response" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/Haemodynamic_response</a>. It is based on the ratio of oxygenated vs. non-oxygenated blood, implying blood flow, and inferred to mean more processing or activation of those brain areas.</p>

CC BY-SA 4.0
2019-05-23T12:34:36.347Z
Thank you. What is the smallest "amount" of brain you can receive this data from?
Borut Flis
CC BY-SA 4.0
2019-05-23T12:41:32.000Z
Spatial resolution in voxels depends on the strength of the MRI magnet. A typical 3T magnet might provide resolution down to a few millimeters, depending on the methods used. More detail: https://en.wikipedia.org/wiki/Functional_magnetic_resonance_imaging#Spatial_resolution
Cameron Brick
CC BY-SA 4.0
2019-05-23T10:33:13.617Z
2019-05-23T10:33:13.617Z
Cameron Brick
<p>Lets say we want to compare the correlation between the activation one part of the brain and rise in value of other variable. The design would be within subjects.</p>

<p>What is the data that we can receive from the fMRI from one specific brain area(e.g. temporal cortex) to use to calculate the correlation.</p>

<fmri><data><correlation>
What type of data can we get from fMRI to calculate correlations?
Borut Flis
# What type of data can we get from fMRI to calculate correlations?

(Asked by: username_0 on 2019-05-22)

Lets say we want to compare the correlation between the activation one part of the brain and rise in value of other variable. The design would be within subjects.

What is the data that we can receive from the fMRI from one specific brain area(e.g. temporal cortex) to use to calculate the correlation.

**Tags:** fmri, data, correlation


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## 1 answers

### Answer by username_1 on 2019-05-23. Score: 1 | Accepted answer

The BOLD response is used in fMRI to provide a quantified measure of activation: <https://en.wikipedia.org/wiki/Haemodynamic_response>. It is based on the ratio of oxygenated vs. non-oxygenated blood, implying blood flow, and inferred to mean more processing or activation of those brain areas.

> **Comments:**
> **username_0**: Thank you. What is the smallest "amount" of brain you can receive this data from?  
> **username_1**: Spatial resolution in voxels depends on the strength of the MRI magnet. A typical 3T magnet might provide resolution down to a few millimeters, depending on the methods used. More detail: https://en.wikipedia.org/wiki/Functional_magnetic_resonance_imaging#Spatial_resolution  

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