How is eeg used to study the brain

If you do get a seizure, your healthcare provider will treat it immediately. Other risks may be present, depending on your specific medical condition. Be sure to discuss any concerns with your healthcare provider before the procedure. Ask your healthcare provider to tell you what you should do before your test. Below is a list of common steps that you may be asked to do. An EEG may be done on an outpatient basis, or as part of your stay in a hospital. Procedures may vary depending on your condition and your healthcare provider's practices.

Talk with your healthcare provider about what you will experience during your test. Once the test is completed, the electrodes will be removed and the electrode paste will be washed off with warm water, acetone, or witch hazel.

In some cases, you may need to wash your hair again at home. If you took any sedatives for the test, you may be required to rest until the sedatives have worn off. You will need to have someone drive you home. Skin irritation or redness may be present at the locations where the electrodes were placed, but this will wear off in a few hours. Your healthcare provider will inform you when you may resume any medicines you stopped taking before the test. Your healthcare provider may give you additional or alternate instructions after the procedure, depending on your particular situation.

Health Home Treatments, Tests and Therapies. Why might I need an EEG? There may be other reasons for your healthcare provider to recommend an EEG. What are the risks of an EEG? Certain factors or conditions may interfere with the reading of an EEG test. These include: Low blood sugar hypoglycemia caused by fasting Body or eye movement during the tests but this will rarely, if ever, significantly interfere with the interpretation of the test Lights, especially bright or flashing ones Certain medicines, such as sedatives Drinks containing caffeine, such as coffee, cola, and tea while these drinks can occasionally alter the EEG results, this almost never interferes significantly with the interpretation of the test Oily hair or the presence of hair spray How do I get ready for an EEG?

Your healthcare provider will explain the procedure to you and you can ask questions. You will be asked to sign a consent form that gives your permission to do the procedure. Read the form carefully and ask questions if something is not clear. Most EEGs are done to diagnose and monitor seizure disorders.

EEGs also can identify causes of other problems, such as sleep disorders and changes in behavior. They're sometimes used to evaluate brain activity after a severe head injury or before a heart transplant or liver transplant. If your child is having an EEG, preparation is minimal. Your child's hair should be clean and free of oils, sprays, and conditioner to help the electrodes stick to the scalp.

Your doctor may recommend that your child stop taking certain medicines before the test. It's often recommended that kids not have caffeine up to 8 hours before the test. If it's necessary for your child to sleep during the EEG, the doctor will suggest ways to help make this easier. An EEG can be done in the doctor's office, a lab, or a hospital.

Your child will be asked to lie on a bed or sit in a chair. The EEG technician will attach electrodes to different locations on the scalp using adhesive paste. Each electrode is connected to an amplifier and EEG recording machine. The electrical signals from the brain are converted into wavy lines on a computer screen.

Below we will go through the ways in which the EEG module can help advance research. EEG data analysis can admittedly be a complex process, which is why iMotions has several features designed to reduce the burden of this step. Frontal alpha asymmetry, a measure used as a proxy for feelings of approach or avoidance, is typically used to provide an assessment of how appealing or repellent a stimulus is.

This and power spectral density PSD can be automatically calculated in iMotions, and the R code used to build the analysis is fully available and transparent. Other manufacturers, such as ABM and Emotiv may also provide the capability to calculate proprietary metrics — such as levels of drowsiness or engagement.

These metrics are also provided within the iMotions software , giving you easy access to detailed insights. There may also be parts of the analysis which you want to exclude, or look at in more detail. The data, whether raw, processed, or segmented can of course also be exported in easily transferable formats, allowing you to take your analysis to whichever platform you prefer. There is also information about computer use, such as mouse clicks and keystrokes, particularly useful when relating stimulus interaction to biosensor data.

Whether you want to gather data from high sampling rate channel devices, flexible and wireless 24 channel devices, or measure frontal asymmetry with an 8 channel headband, iMotions provides straightforward solutions for each. Biosensors such as eye trackers screen-based, glasses, or virtual reality , facial expression analysis, EDA , ECG , and EMG among others can be readily included in any experiment.

This allows data from other sensors to be sent in to iMotions and synchronized with other data sources. This is complemented by the possibility to use the open API to connect essentially any other data stream.

Virtually any data-producing device can be connected into iMotions, creating new research possibilities. As with many devices and most things in life : you get what you pay for.

Many of the devices at the upper ends of the pricing range are particularly advanced, research-grade devices that provide incredible sensitivity, with a large number of sensors too. This is why we have set out the range of prices you are likely to find when searching for the EEG headset that is perfectly suited to your needs.

The specific prices can be hard to pin down, as some are not public, or can be subject to academic discounts, and can fluctuate with changing currency prices, amongst other reasons. Making a choice between devices is of course best done with an expert at hand, and we are always available if you want to discuss your needs.

Below you will find the price range of headsets from some of the leading manufacturers. Experiments are rarely alike, and this is reflected in the diversity of stimuli types.

The EEG devices are automatically synchronized with the stimuli, and any other devices that might be connected — allowing you to let iMotions run the experiment for you.

Depending on your needs iMotions also offers several analysis capabilities that can help expedite the experimental process. This means there is no need for a complex and costly patchwork setup of software — the entire experiment can be controlled and carried out in iMotions. The functional significance of delta oscillations in cognitive processing. Frontiers in Integrative Neuroscience. EEG alpha and theta oscillations reflect cognitive and memory performance: a review and analysis.

Brain Res. Regional brain wave activity changes associated with fatigue. Psychophysiology — Alpha-band oscilaltions, attention, and controlled access to stored information.

Trends Cogn Sci. Propagating waves in human motor cortex. Front Hum Neurosci. Neural mechanisms of brain-computer interface control. Neuroimage 55, — Doi: Gamma Rhythms in the Brain.