What can combined EEG-fMRI tell us about the brain activity that two separate EEG and fMRI experiments cannot?

Why would researchers use EEG and fMRI together?

fMRI and EEG therefore represent complementary imaging techniques, and combining information from them is a particularly useful way to examine the spatial and temporal dynamics of brain processes (Babiloni et al., 2004; Dale et al., 2000; Liebenthal et al., 2003; Menon et al., 1997).

What do an EEG and an fMRI have in common?

An appealing aspect of the combination of these methods is the fact that both EEG and fMRI are overlapping in their sensitivity to synaptic processing and accordingly brain function can be assessed by means of simultaneous EEG-fMRI with high temporal and high spatial resolution.

What does fMRI tell us about the brain?

It may be used to examine the brain’s functional anatomy, (determine which parts of the brain are handling critical functions), evaluate the effects of stroke or other disease, or to guide brain treatment. fMRI may detect abnormalities within the brain that cannot be found with other imaging techniques.

What is the difference between an EEG and an MRI of the brain?

MRI has a higher spatial resolution than electroencephalography (EEG). MRI with hyperintense lesions on FLAIR and DWI provides information related to brain activity over a longer period of time than a standard EEG where only controversial patterns like lateralized periodic discharges (LPDs) may be recorded.

What does fNIRS measure?

Functional near-infrared spectroscopy (fNIRS) is a non-invasive brain imaging technique that measures blood oxygenation changes similar to fMRI. The technique is based upon the changes in absorption of light emitted by sources onto the surface of the head and measured by detectors.

What are the advantages of EEG?

Advantages of EEG:

  • They are functionally fast, relatively cheap and safe way of checking the functioning of different areas of brain.
  • High precision time measurements.
  • Today’s EEG technology can accurately detect brain activity at a resolution of a single millisecond..
  • EEG electrodes are simply stuck onto the scalp.

Does EEG measure brain activity?

EEG brain activity

An EEG records the electrical activity of your brain via electrodes affixed to your scalp. EEG results show changes in brain activity that may be useful in diagnosing brain conditions, especially epilepsy and other seizure disorders.

What are the advantages and disadvantages of a EEG?

One of the biggest advantages to EEG/ERP is the ability to see brain activity as it unfolds in real time, at the level of milliseconds (thousandths of a second). One of the big disadvantages of EEG/ERP is that it’s hard to figure out where in the brain the electrical activity is coming from.

Why is EEG not well suited to identify the exact location of a process in the brain?

Particularly strong electrical activity can be picked up by several neighboring electrodes. The EEG signal, therefore, is not useful for pinpointing the exact source of the activity, and it does not allow researchers to distinguish between activities originating in different but closely adjacent locations.

What are 10 conditions diagnosed with an EEG?

10 Conditions Diagnosed With an EEG

  • Seizure Disorders. The primary use of EEG is diagnosing epilepsy and other seizure disorders. …
  • Sleep Disorders. Sleep disorders range from insomnia to narcolepsy. …
  • Brain Tumors. There are many types of brain tumors. …
  • Brain Injury. …
  • Dementia. …
  • Brain Infections. …
  • Stroke. …
  • Attention Disorders.

What kind of pathological conditions may be diagnosed using EEG?

Other conditions that may be diagnosed with the aid of an EEG include:

  • Sleep disorders (such as narcolepsy)
  • Head injuries.
  • Brain infection.
  • Brain haemorrhage.
  • Alzheimer’s disease.
  • Degeneration of brain tissue.
  • Metabolic conditions that affect brain tissue.
  • Hormonal conditions that affect brain tissue.

Which of the following is a reason that the EEG has poor spatial resolution?

Although EEG provides good temporal resolution of millisecond or less, it does not provide good spatial resolution. There are two main reasons for the poor spatial resolution: the blurring effects of the head volume conductor and poor signal-to-noise ratio.

What are the disadvantages of an EEG?

A drawback for EEG is the spatial resolution – as the electrodes measure electrical activity at the surface of the brain, it is difficult to know whether the signal was produced near the surface (in the cortex) or from a deeper region.

What does an MEG show?

Magnetoencephalography (MEG) is a non-invasive medical test that measures the magnetic fields produced by your brain’s electrical currents. It is performed to map brain function and to identify the exact location of the source of epileptic seizures.

Which technique used to study the brain has good temporal but poor spatial resolution?

electroencephalography (EEG)

Among the different brain imaging techniques, electroencephalography (EEG) is classically considered as having an excellent temporal resolution, but a poor spatial one.

Why does EEG have good temporal resolution?

High temporal resolution is necessary to resolve the rapidly changing patterns of brain activity that underlie mental function. Electroencephalography (EEG) provides temporal resolution in the millisecond range.

Which one fMRI EEG has a better spatial resolution which one has a better temporal resolution?

EEG and fMRI are the two crucial modalities which reflect the functional activity inside the brain. EEG is easy to apply and provides high temporal resolution but has poor spatial resolution. Contrarily, fMRI has a higher spatial resolution while having a poor temporal resolution.

Does EEG or fMRI have better temporal resolution?

The temporal resolution of EEG is excellent, managing to capture neural events in the order of milliseconds. On the other hand, its spatial resolution lacks precision. Conversely, fMRI offers high spatial resolution, typically on the order of mm3.

Which neuroscience method has lowest temporal resolution?

The temporal resolution with PET is poor compared to both fMRI, EEG and MEG, and is limited by both the technique and the metabolism of the tracer molecule. Spatial resolution refers to how accurately the measured activity is localised within the brain.

How can the spatial resolution of an EEG be improved?

The surface Laplacian method is a direct approach to improve the spatial resolution of each EEG electrrode. The surface Laplacian is the second spatial derivative of the scalp potentials along an approximation to the scalp surface, which provides estimates of the cortical surface potentials from the scalp potentials.