<unk>  is a method for measuring dynamics of brain activity through the minute voltage changes observable on the skin, typically by placing electrodes on the scalp. In<unk> , the electrodes are exclusively placed in or around the outer<unk> , resulting in both a much greater invisibility and wearer mobility compared to full scalp electroencephalography <unk> , but also significantly reduced signal amplitude, as well as reduction in the number of brain regions in which activity can be measured. It may broadly be partitioned into two groups: those using electrode positions exclusively within the concha and<unk>  canal, and those also placing electrodes close to the<unk> , usually hidden behind the<unk>  lobe. Generally speaking, the first type will be the most invisible, but also offer the most challenging (noisy) signal.<unk>  is a good candidate for inclusion in a hearable device, however, due to the high complexity of<unk>  sensors, this has not yet been done.
Ear-EEG
Audiometry
Neurovax
Stereotaxic atlas
Hearing test
Vibroacoustic stimulation
Audio power amplifier
Cranio-corpography