EEG, PET, and TMS are all: (Points: 5)
laboratory observations that introduce experimenter bias into the study.
descriptive methods for studying the brain.
standardized methods for studying the brain.
experimentally controlled technologies for brain-wave analysis.
I think it is B
You are correct, option B is the correct answer. EEG (Electroencephalography), PET (Positron Emission Tomography), and TMS (Transcranial Magnetic Stimulation) are all descriptive methods for studying the brain.
To arrive at this answer, let me explain how each of these methods works:
1. EEG (Electroencephalography): This method involves placing electrodes on the scalp to measure the electrical activity of the brain. It is a non-invasive technique that records the brain's electrical patterns, primarily used to study brain activity during different states like wakefulness, sleep, and various cognitive tasks.
2. PET (Positron Emission Tomography): PET uses small amounts of radioactive material called radiotracers to visualize brain activity. These tracers are injected into the bloodstream and are absorbed by brain cells. As the radiotracers decay, they emit positrons, which are detected by a scanner. By measuring the positron emissions, PET can provide information about brain metabolism and blood flow, indicating areas of increased activity.
3. TMS (Transcranial Magnetic Stimulation): TMS involves the use of a magnetic field to stimulate specific regions of the brain. A coil placed on the scalp generates a magnetic field that induces small electrical currents, which can either stimulate or inhibit brain activity depending on the duration and intensity of the pulses. TMS is often used to temporarily disrupt normal brain activity in a particular area, allowing researchers to understand the role of that region in cognitive or motor processes.
These methods are all descriptive, as they provide information about the brain's structure, function, or activity. They help researchers observe and describe various aspects of the brain, such as electrical patterns (EEG), metabolic activity (PET), or the effects of stimulating specific brain regions (TMS). Therefore, option B is the correct answer.