8
votes
Why the brain region with less activity is not more responsible for some action?
The thing neuroscientists do is look at the differences in brain activity. They thus don't see "a high activity in brain area X". Instead, they see, between condition A and B, a difference in activity ...
- 3,172
8
votes
Accepted
How do we know human brain development stops around age 25?
Based on a review by Kolb et al, 2012, it seems that "the brain is finished developing by 25" refers to the point when synaptic pruning in the cerebral cortex levels off, on average. However, the ...
- 446
5
votes
Voltage sensitive dyes technique: What is the underlying measure?
I found that dF/F0 stands for the relative difference in fluorescence at a certain wavelength.
- 131
5
votes
Can we identify specific emotions on the basis of fMRI scans?
From meta-analyses that include musical emotion inductions, there is not much evidence that we can reliably distinguish between emotions in the brain, independent of the emotion induction procedure or ...
- 4,388
4
votes
Is there a complete connectome of a minicolumn of the neocortex?
Unfortunately not. The closest publication would be Lee et al 2016, which is a reconstruction of a network of functionally-characterised neurons in mouse V1. They state the data "will be available" at ...
4
votes
Accepted
Is sign language handled differently by the brain than spoken laguage?
For a broad meaning of "similarly", the answer is yes, the processing of sign language has substantial similarities with that of spoken language, in terms of brain areas involved. There are ...
- 10.2k
3
votes
where can i find preprocessed fmri data set for alzheimer's disease
See https://www.reddit.com/r/neuro/comments/5y4pta/does_anyone_know_where_i_can_find_a_repository_of/ for a similar question.
Websites that were posted there include http://www.humanconnectome.org/...
- 1,855
3
votes
During body-scan ('sweeping') meditation, what does brain-imaging (e.g. fMRI) look like?
The Mind of the Meditator may be what you are looking for:
https://www.nature.com/scientificamerican/journal/v311/n5/full/scientificamerican1114-38.html
The image taken from the article gives some ...
3
votes
Accepted
In fMRI analyses, what is the t-test actually comparing?
The coefficient is the measure of how strongly the given factor predicts the dependent variable, or in other words how much of the variance in the dependent variable can be explained by that factor. ...
- 146
3
votes
Jung's Anima and Neurological Basis in Split-Brain Patients; Left-Persona and Right-Anima
Perhaps a more useful way of looking at these concepts is to consider anima in terms of the hindbrain, which takes sensory inputs from both the body and external stimuli and creates a virtual model ...
- 31
3
votes
What is the best way to turn EEG scans in to 3D images?
By 3D image, I assume that you want a projection of the topographic map onto a 3D model of the head. For an accurate resolution, you would need to have acquired the position of the EEG channels on the ...
- 578
3
votes
How many possible states does a brain have?
2 2,752,000,000,000,000,000,000 states
Disclaimer: This is obviously a very crude and imprecise estimation (in fact, it is ignoring some obvious parameters for the sake of simplicity). As Scott E. ...
- 1,115
3
votes
What computerized EEG analysis algorithms are there?
Also FieldTrip for Matlab, and MNE for Python
- 981
3
votes
Have EEG signals in auditory speech perception task have ever been analyzed for correlation with auditory stimuli itself?
Extensively. Most prominently, recently, by David Poeppel, Oded Ghitza and Anne-Lise Giraud, in a series of papers. They've, to be precise, mostly focused on MEG correlations with the filtered speech ...
- 2,414
3
votes
Accepted
Frissons on demand
Apparently voluntary piloerection is extremely rare amongst the popoluation. Only about 35 people out of about 7.6 billion people in the world have been confirmed to exhibit voluntary piloerection in ...
- 241
3
votes
Is what psychologists define as subconsciousness proven in neuroscience and can the psychological subconsciousness be visualized by neuroscientists?
The vast majority of neural processes (and their associated mental processes) in the brain are subconscious (or unconscious), i.e. we are not consciously aware of them and cannot consciously control ...
- 1,825
3
votes
Accepted
Does only the time-series data of fMRI matter or does spatial distribution of the signal values also matter?
Usually, but not always, fMRI timeseries are used to compute functional connectivity by calculating Pearson correlations among voxels or ROIs.
The equation for the Pearson correlation can be written ...
- 7,221
3
votes
Accepted
What does it mean if a neuron is "expressing" something?
Gene Expression
"Expressing" refers to gene expression - in biology we say a cell is "expressing" a gene when the products of that gene are present. "Sst-expressing cell" ...
- 7,221
2
votes
Are there any studies that were able to localize Fusiform Face Area (FFA) for face processing using EEG source localization algorithms?
The N170 (the face selective component of the brain) is commonly mapped indeed to OFA or FFA. It's trivial to find examples for this, e.g.: this, this, this, this, this. Many more studies can be found ...
- 2,414
2
votes
MRI images upside-down in FSLVIEW
Simply fslreorient2std will orient the images as you would expect.
From https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/Orientation%20Explained:
fslreorient2std - this ...
- 121
2
votes
Where can I find good references about the neuronal connections in various areas in the cortex?
Diffusion tensor imaging (DTI for short) may be the technique you are after. It is able to record nerve fibers in MRI images. I couldn't find the specifics you were after, and the subdivision into ...
- 20.5k
2
votes
Accepted
How to install MARSBAR toolbox in SPM12?
Thanks for the comments, @serk1. The answer to this question is that that is a bug, it seems.
I gave up editing the scripts myself and decided to reinstall Matlab and Marsbar, and it properly ...
- 317
2
votes
Accepted
What does 'Mean Diffusivity' tell me about the connectivity of cortical areas?
Short answer
The mean diffusivity (MD) in diffusion tensor imaging is a sensitive, yet a rather non-specific measure. Changes in MD tell you that water movement is altered, yet why and how will have ...
- 20.5k
2
votes
Difference between reverse inference and decoding (e.g. MVPA) in fMRI
Note. I initially scan read the question, I have rewritten my answer as a consequence, and due to the comments given.
As highlighted by others here Multi-voxel pattern analysis (MVPA) is an ...
- 1,196
2
votes
Open access 7T resting-state fMRI dataset
The Nighres project has released some 7T MRI datasets and tools to run them. You can read the paper on the tools here, and download the datasets from NITRC here.
2
votes
Can we identify specific emotions on the basis of fMRI scans?
Short answer
Pleasant and unpleasant music activate other areas of the cortex, potentially allowing for differentiation of music-related emotions based on fMRI scans alone.
Background
An fMRI study ...
- 20.5k
2
votes
How can I visualize DTI tractography streamlines generated from FSL's probtrackX in 3D?
I must say I am not an expert, but the following sources look helpful:
Gao et al. (2013) write
The voxel value in the resulting dataset represents the number of
streamline samples passing ...
- 20.5k
2
votes
What does "they tend within and between classes" mean in 'The Irreducible Mind'?
This is kinda unclear so I'm not sure my reading is the correct one. But for me the two classes are the electric/magnetic class of imaging techniques and the hemodynamic/metabolic class of imaging ...
- 1,389
2
votes
Accepted
Are scintillating scotomas really caused by cortical spreading depression? If so, how is this known to be true?
The primary visual cortex is topographic, which means that specific parts of that brain region correspond exactly to specific parts of your visual field. In order to prove that a scotoma (literally a ...
- 42
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