Questions tagged [neuroimaging]

For questions about techniques to directly or indirectly image the structure, function, or pharmacology of the brain.

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30 views

How does processing of T1 images affect tractography after registering the DWI to T1?

At the moment I believe that registering (aligning) Diffusion Weighted Images (DWI) to T1 images only allows for the DWI to have a parcellation basis, and otherwise it does not give much information. ...
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1answer
65 views

Why the brain region with less activity is not more responsible for some action?

From my naive understanding, it seems that when people try to find correlations between a human action and a certain pattern of activity in the brain, they measure the brain activity with some device ...
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63 views

How to convert fmri brain volumes to brain graph [closed]

I am working with fMRI data of Alzheimer's Disease (AD) patients. I want to convert brain volumes to brain graph and then using different graph metrics, I want to classify the brain volumes in AD and ...
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1answer
468 views

where can i find preprocessed fmri data set for alzheimer's disease

I want to work on identification of Alzheimer's patients based on given fMRI data.Basically, I want to implement the following paper https://www.ncbi.nlm.nih.gov/pubmed/25907414. Where can I get ...
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NiftyReg reg_resample results in strange artifacts when registering MNI-ICBM-152 atlas

I'm using NiftyReg for image registration, and I have several artifacts when applying the warp from a non-linear registering of de facto standard MNI-ICBM-152 atlas. Here are a few slices showing the ...
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2answers
2k views

Difference between reverse inference and decoding (e.g. MVPA) in fMRI

Reverse inference, i.e. the use of brain activation (fMRI) data to infer the engagement of a certain mental function, is heavily criticised (e.g., Poldrack 2011, Neuron). At the same time, decoding, ...
5
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1answer
89 views

Is there a complete connectome of a minicolumn of the neocortex?

I know that there are projects that try to map brain connectivity. My question is whether there is a dataset available with the complete connectivity of just a single minicolumn of the neocortex. ...
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44 views

Library (or manual creation) of ERP components

I'm looking to test some computational models using ERP components as inputs (eg. p300, n170) I'm wondering if there is an existing library anywhere that would have a bank of wave/component examples ...
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1answer
71 views

What are the main differences between the FreeSurfer volumetric approach and the statistical parametric mapping from SPM?

In modern research of brain volume and function there are two main players. FreeSurfer which is free of cost and open source and the older, but more frequently used, statistical parametric mapping ...
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121 views

Is there a tangible benefit of synchronising the sample clock to the laser pulses in a resonant scanning two-photon microscope?

NI data acquisition cards offer a possibility of synchronising data acquisition with the pulses of a 80 MHz Ti:Sapphire laser. This supposedly helps improve the signal to noise ratio, since the true ...
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138 views

EEG electrode cluster selection

Is there a good review paper on electrode selection in EEG analysis to avoid the problem of double dipping (Kilner, 2013)? This is a well documented issue in neuroimaging (Kriegeskorte et al, 2009; ...
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1answer
76 views

Voltage sensitive dyes technique: What is the underlying measure?

I just discovered voltage sensitive dyes technique: I have seen that figures are labelled with dF/F0, what does it stands for?
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1answer
1k views

LAURA/LORETA source localization in Matlab

Is there a Matlab toolbox for doing source localization using LAURA or sLORETA within Matlab (not requiring additional software like LORETA-KEY, etc.)?
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286 views

Is there an equivalence table between the Desikan-Killiany atlas to brodmann areas?

FreeSurfer makes inferences about volume, through the calculation of the surface of the brain. The parametric method (used in SPM) is a voxel-based statistics. FreeSurfer analysis does not map the ...
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2answers
238 views

Open access 7T resting-state fMRI dataset

I'm looking for an open access dataset of 7-tesla resting state fMRI images of human subjects. I've been able to find one so far (http://www.nature.com/articles/sdata201454). However, I need images ...
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2answers
1k views

How to install MARSBAR toolbox in SPM12?

I am trying to install MARSBAR toolbox into SPM12, but I am running into different problems. Initially they were all related to directory ownership and permissions (using Ubuntu 14.04), which I ...
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1answer
159 views

Finding the anterior comissure to set origin in a SPECT image using SPM/ISAS

I am learning how to use SPM and ISAS to analyze ictal and interictal SPECT. However I am stuck at a point of their tutorial. In the item 1.2 one has to set the origin for the SPECT image. That is, ...
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1answer
312 views

What is the best way to turn EEG scans in to 3D images?

I'm looking for the best way to turn standard EEG scans into 3D images of activity in the brain over the time of scanning, for example like the Glass Brain images or even connectome-style images. I ...
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1answer
40 views

Where can I find good references about the neuronal connections in various areas in the cortex?

As an example, I would like to know which Brodmann areas innervate the layer IV of area 10 in the brain. To which degree are these connections known? What are good books or other kinds of resources ...
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1answer
202 views

How to import images used to analysis in SPM to FreeSurfer

FreeSurfer uses the recon-all command to semi-automatically generate its statistics. This tool implies a certain directory structure in which the files with the images for the samples should be ...
4
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1answer
362 views

Batch converting .img files to .mgz in FreeSurfer

I have a series of .img files from a previous analysis in SPM that Freesurfer (FS) cannot directly handle. FS comes with a conversion tool, the mri_convert command, but I am not able to make it run ...
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1answer
1k views

Structural neuroimaging processing with FreeSurfer or SPM?

I have a limited amount of time to analyse strucutural neuroimaging from a sample of patients. My objective is to simply extract volumes from selected fronto-parietal areas. I have no previous ...
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1answer
58 views

Have EEG signals in auditory speech perception task have ever been analyzed for correlation with auditory stimuli itself?

This can be useful for getting a better grip on understanding the link between actual stimuli, brain processing, and EEG data.
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129 views

What is the general frequency (or range of frequencies) of “sparks” in the human brain per minute and at what locations? [closed]

How many electrical sparks occur in the brain, on average, per minute and at what structures do they occur? For the "how many" figure, I would be happy to have ranges here from relaxed to excited ...
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1answer
121 views

Are there any studies that were able to localize Fusiform Face Area (FFA) for face processing using EEG source localization algorithms?

I am looking for references where people were able to collect 128-256 channel EEG data during face perception task and the map it onto FFA or OFA using source localization algorithms?
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1answer
2k views

How many possible states does a brain have?

Suppose I have a box, inside of which is a light which can be either on or off: it has exactly two states. Suppose I wanted to take some "snapshot" of the state of this device, and store all the ...
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53 views

Let's say I have an MRI scan of my brain. What exactly can I learn from it? [closed]

Asking this because I participated in an MRI study today at my local University, and the compensation will be an emailed 'picture of my brain'. Note that I intend this question to be catered towards ...
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1answer
104 views

Open magnetic resonance imaging datasets on psychosis?

Are there any open magnetic resonance imaging datasets of normal and healthy adults (as controls) and psychotic subjects? Such as ADNI for Alzheimer's or OASIS for aging.
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1answer
150 views

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

In terms of impact factor (for a lack of a better proxy), what are the highest ranked neuroscience journals that use double-blind review process? I would be submitting a paper that combines ...
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54 views

reliability of fmri and pet [closed]

While I admit that pet/frmri scanning is possibly reliable when measuring physical aspects of the body, I would like to know how reliable it is when measuring cognitive aspects e.g. emotion. How ...
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1answer
108 views

Slices and aquisition of fMRI

Is a slice obtained with functional MRI (fMRI) always 3-dimensional, i.e., x-y-z? I thought that a typical fMRI scan's total imaged volume would be 4D, i.e., made up of 3D slices plus time.
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30 views

Simultaneous DTI, structural MRI and 1H-MRS - Are there any examples of this?

I have been reading about recent articles relating to treatment resistant schizophrenia, and apparently there are a lack of studies using multimodal imaging. Initially I just thought that would be ...
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413 views

What are the brain regions related to tinnitus shown in this figure?

I am interested in learning about the neural mechanisms behind tinnitus, and was wondering if someone could help me to name the parts of the brain on this image that show increased activity in ...
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1answer
572 views

How does glial cell activity influence fMRI, EEG signals?

Glial cells comprise about 80% of the cells in the human brain. But physiological models of EEG and fMRI often relate only to neuronal activity. How do glial cells affect large-scale imaging ...
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1answer
485 views

What does fMRI measure exactly

It is true that blood flows to wherever the brain is most activated and does fMRI measure the blood flow inside of the brain through oxygen content?
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1answer
76 views

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

What are the effects of MRIs and other electromagnetic devices on the human brain? Naturally they could move metals to or through the brain cell's membrane. I can also see the experience of being in a ...
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1answer
223 views

Why “fractional” anisotropy?

Why is Fractional Anisotropy (FA), a measure in diffusion tensor imaging, called "fractional"? I'd have thought "local", i.e. voxel-wise, would have been the correct way to qualify the anisotropy that ...
5
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2answers
641 views

Why is it hard to simulate a neuron?

I read a NY Times article about the European effort to simulate a human brain and the criticism regarding the (non-)feasibility of such an endeavor (not to mention the astronomical costs). In this ...
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1answer
905 views

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

I know that it is possible to detect "focus" with a consumer EEG with a single electrode and a reference point (ear clip), even without conductive gel, but is it possible to detect a flow state with ...
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2answers
1k views

Where do our memories get stored and how are they retrieved again?

There is a common knowledge that several brain areas are involved in memory processes and each area is involved in a different aspect of memory. But where do our memories get stored and how are they ...
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0answers
74 views

Brain structures related to risk-taking behavior

I did a preliminary research on brain structures in which activity might underlie risk-taking behavior. I came to two research that described right prefrontal cortex (Knoch et al., 2006), or ...
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3answers
216 views

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

Several scientific projects are trying to map the connectome, such as The Human Connectome Project. The connectomes of other organisms, such as C. elegans, have been mapped already. Having an ...
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1answer
1k views

Is there difference between a memory of a dream and memory of waking experience?

I'm very interested in dreaming and have pretty good dream recall. This makes me able to recall and distinguish hundreds of experience within my memory and label them as "dreams". I'm trying to ...
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2answers
2k views

MRI images upside-down in FSLVIEW

I'm visualizing structural data in FSLVIEW, but the sagittal and coronal planes are both upside-down / not in the conventional orientation, i.e. rotated by 90º and 180º. I understand that this upside-...
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2answers
943 views

How to make diagnosis of these symptoms using Pet scan, fMRI, and EEG? [closed]

The symptoms are muscle weakness, slow reaction time, visual perception issues, seizures, hearing loss, weight gain, general sense of pain and delusions. Using the above scanning techniques, a doctor ...
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1answer
346 views

Can tinnitus be measured with EEG or MEG?

Can tinnitus be measured with EEG or MEG (magnetoencephalography)? Is it visible in a power spectrum? In an ERP/ERF?
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2answers
267 views

Neurotransmitter control via biofeedback?

According to this thread, certain regions of the brain, and even some distributed activation patterns can be up/down regulated via bio-feedback. Is it possible in theory and is there any research ...
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76 views

Diagram of the peripheral nervous system of different animals? [closed]

Can anyone recommend a good resource (free or paid) for finding detailed images of the nervous systems of various animals? In particular I am looking for images of the peripheral nervous system of ...
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0answers
433 views

Steady State Topography and Advertising/Preference: Weaknesses? Criticism?

Steady-state topography is a derivation of EEG/ERPs using an evoked potential to an ongoing oscillating stimuli called the steady state visually evoked potential (SSVEP). Variations in the phase ...
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2answers
338 views

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

I've long been interested in dreaming and there's a peculiar phenomenon of the very start of the dreaming process. Different people experience it differently, but even for the same person there's ...