What are the limitations of brain imaging techniques?
- Expensive to use.
- Cannot be used in patients with metallic devices, like pacemakers.
- Cannot be used with uncooperative patients because the patient must lie still.
- Cannot be used with patients who are claustrophobic (afraid of small places).
What are the limitations of the fMRI?
Yet fMRI also has its disadvantages. First, it’s expensive. Second, it can only capture a clear image if the person being scanned stays completely still. And third, researchers still don’t completely understand how it works.
What is a major weakness of current functional neuroimaging techniques?
The fMRI signal is probably insensitive to many critical aspects of neural activity or computation—it just cannot detect all relevant neural changes that are associated with a mental state of interest. Further, the imaging signal is integrated over several seconds and several hundreds of thousands of neurons.
Which of the following brain imaging techniques is least invasive?
EEG is cheap, non-invasive, relatively easy to set-up and the time resolution is excellent: down to less than 1 ms or, in other words, lower than the time needed to have an action potential. On the other hand, the spatial resolution of EEG is higher than other brain imaging techniques (about 1-2 cm).
What is the best brain imaging technique?
Magnetic resonance imaging (MRI) and functional magnetic resonance imaging (fMRI) scans are the form of neural imaging most directly useful to the field of psychology.
Does MRI have high temporal resolution?
In fMRI, images can be collected in a very short time; therefore, high temporal resolution is possible in principle. However, the temporal resolution is limited by a blurred intrinsic hemodynamic response and a finite signal-to-noise ratio.
What is the oldest brain imaging technique?
Direct measures of neural activity: EEG and MEG EEG is the oldest functional brain imaging technique, dating back to Berger’s discovery in 1929 that brain electrical activity could be recorded from electrodes placed on the scalp.
What brain scan has best spatial resolution?
Thus, fMRI is considered to have the best spatial resolution among the functional neuroimaging techniques. The operating costs of fMRI are more reasonable than the nuclear imaging techniques (PET and SPECT).
Which of the following parts of the brain is most active in decision making?
The Prefrontal Cortex (PFC) and hippocampus are the most critical parts of the human brain for decision making.
How are NIRS and optical brain imaging similar?
NIRS operates according to the same principle as optical brain imaging techniques that have been used in animals. Both techniques capitalize on the fact that changesinhemoglobinconcentrationincorticaltissue affect the absorption of infrared light by the tissue.
How are anatomical techniques used in brain imaging?
Additionally, anatomical techniques are used in conjunction with functional techniques in order to localize brain activity. The earliest technique for imaging brain structure was computed tomography (CT). Today, it has been largely replaced by the much more powerful tech- nique of magnetic resonance imaging (MRI).
What are the first challenges of brain imaging?
The first challenge is that you have to learn a lot of technical detail to really understand how little information the technology provides.
What are the disadvantages of a brain scan?
One disadvantage is that the patient has to hold still for long periods of time in a noisy, cramped space while the imaging is performed. Brain MRI: MRI brain scan (in the axial plane—that is, slicing from front-to-back and side-to-side through the head) showing a brain tumor at the bottom right.