12 votes
Accepted

What does fMRI measure exactly

As a slight modification of your statement: blood flow increases wherever activity in the brain increases. The type of fMRI that uses this principle is blood-oxygenation-level-dependent fMRI or ...
user avatar
  • 19.6k
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 ...
user avatar
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 ...
user avatar
  • 436
7 votes

Is it possible to detect the mental flow state with EEG?

Bearing in mind the fact that I can't prove a negative, I'm going to say "No, it's not (yet) possible". Flow is rather loosely defined (e.g. "merging of action and awareness"), so coming up with hard ...
user avatar
7 votes

How does glial cell activity influence fMRI, EEG signals?

I'm only going to attempt to answer a small part of your question: how does glial activation affect the blood oxygen level-dependent (BOLD) response measured by fMRI? Schulz et al. (2012) were able ...
user avatar
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.
user avatar
  • 131
5 votes

What are the highest ranked neuroscience journals that use double-blind review process?

Nature Neuroscience offers such a possibility. http://www.nature.com/news/nature-journals-offer-double-blind-review-1.16931 See also Does anyone know of any clinical psychology journals that use a ...
user avatar
  • 1,274
5 votes

Have the effects of MRIs and other electromagnetic devices on human psychology been studied?

Yes, the effects of electromagnetic fields on the brain have been studied extensively, especially with respect to cellphone, WiFi, and other small devices that emit such fields. The results are ...
user avatar
  • 18.1k
5 votes
Accepted

What happens in the brain when conscious awareness is changed during dreaming onset?

Here is the first study with fMRI, EEG and eye-video simultaneously recorded while subjects were performing a task (Poudel et al., 2014). "fMRI analysis revealed a transient decrease in thalamic, ...
user avatar
  • 1,151
5 votes
Accepted

Why is it hard to simulate a neuron?

Complexity. That is, the fundamental laws governing the behavior isn't terribly difficult to comprehend or model. However, putting it all together and hoping it reproduces the correct behavior is a ...
user avatar
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 ...
user avatar
  • 4,256
4 votes

What happens in the brain when conscious awareness is changed during dreaming onset?

You're describing Hypnagogia. There has been some research on the EEG states during hypnagogia: To identify more precisely the nature of the EEG state which accompanies imagery in the transition ...
user avatar
  • 191
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 ...
user avatar
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 ...
user avatar
  • 9,915
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 ...
user avatar
3 votes

Why "fractional" anisotropy?

Like lea's comment indicated, FA is called "fractional" anisotropy simply because it's the degree of anisotropic diffusion, i.e., a ratio (Soares, Marques, Alves and Sousa, 2013). Fractional ...
user avatar
3 votes
Accepted

Slices and aquisition of fMRI

I will focus on question #1: Analysis of MRI scans is typically done using voxels (Fig. 1). Voxels have a volume defined by three dimensions (length, width and depth). Voxel analysis. Source: ...
user avatar
  • 19.6k
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. ...
user avatar
  • 1,115
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 ...
user avatar
  • 2,414
3 votes

What kinds of information can (and cannot) be extracted from connectome?

First at all, the connectome must be interpreted like a static picture of the brain. So anything related with plasticity and dynamical processes will be lost in this map. There are connectome at ...
user avatar
  • 84
3 votes

What computerized EEG analysis algorithms are there?

Also FieldTrip for Matlab, and MNE for Python
user avatar
  • 981
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/...
user avatar
  • 1,845
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 ...
user avatar
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 ...
user avatar
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. ...
user avatar
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 ...
user avatar
  • 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 ...
user avatar
  • 1,795
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 ...
user avatar
  • 6,174
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" ...
user avatar
  • 6,174

Only top scored, non community-wiki answers of a minimum length are eligible