Anatomy
Definition
The earlobe is the soft, lower part of the outer ear and is composed mainly of skin, connective tissue, and fat rather than cartilage.
Aliases and abbreviations
auricular lobule · lobule
Editorial record
Published: August 25, 2026 · Reviewed: August 25, 2026
Expanded definition
The earlobe, or auricular lobule, hangs below the cartilaginous framework of the outer ear. Its structure and innervation differ from the tragus and conchal regions used in many active taVNS protocols.
Researchers often choose the earlobe as a sham or comparison site because it is generally treated as having little or no direct auricular vagal supply while still allowing a participant to feel stimulation.
A sham site must still be evaluated. Sensation, blinding, electrode contact, current spread, and possible physiological effects determine whether an earlobe control is credible for a particular study.
What the term does not establish
Why the distinction matters
The distinction helps readers understand why earlobe stimulation may be used as a control and why sham validity must be demonstrated rather than assumed.
Main guide
A guide to ear locations, active placement, sham design, and careful interpretation.
Read the auricular guideSources and further reading
Related terms
Safety and research
Anatomy
Stimulation methods
Anatomy
Anatomy
Protocol and stimulation parameters
Editorial scope
This glossary entry supports general education. It does not diagnose, recommend treatment, or transfer findings from one VNS method, protocol, or device to another.