Item 42 a participant in a study of music perception listens to music with electrodes attached to her scalp while data are collected on the activity of her brain. this technique is called

This technique is called as Electroencephalography(EEG).

Explanation:

EEG is a diagnostic technique to track the electrical activity of the brain with the help of small electrodes wires that are placed on the brain especially on the scalp. The technique is used to diagnose abnormal conditions in brain such as epilepsy, head injuries, headaches, brain tumors,abnormal brain activity,brain death and sleeping problems.The electrical pattern of the brain is acquired in a wave form with varying amplitude and frequency known as Electroencephalogram.