This article examines a recently surfaced patent application that describes earbuds capable of sensing a wide range of body signals, walking through what the filing says, which biosignals the device aims to record, and why those capabilities could feel invasive to users.
Online researchers found a patent filed in January 2023 by Apple Inc. titled “Biosignal Sensing Device Using Dynamic Selection of Electrodes,” which remains pending. The filing lays out a system of electrodes placed in or around the outer ear that could pick up electrical activity from the brain, eyes, muscles, heart, skin, and blood flow. Images included with the application resemble familiar wireless earbuds, suggesting a mainstream form factor for this sensing tech. The document describes the earbuds as a wearable electronic device, such as an earbud or a pair of earbuds.
The core claim is that these wearable devices would “measure biosignals of a user of the wearable electronic device,” and then lists several specific modalities. Those include electroencephalography, electrooculography, electromyography, electrocardiogram, galvanic skin response, and blood volume pulse. Collecting that mix of signals in one compact device would be a notable technical jump from simple audio functions to continuous biometric monitoring.
‘The device may have more electrodes than are necessary.’ That exact line appears in the filing, explaining a design choice: the hardware could include extra electrodes so the system can dynamically select the subset that works best as the device shifts position in the ear. The idea is to maintain reliable signal capture despite imperfect fit or movement, swapping among electrodes to find the cleanest inputs at any moment. That dynamic selection is central to the patent’s approach to practical, everyday use.
The patent’s EEG ambitions mean the earbud would act as a miniature brain sensor, measuring electrical brain activity without the need for scalp electrodes. Electroencephalography tracks how neurons fire and interact, producing measurable voltages that can be interpreted in many ways, from sleep and attention states to neural rhythms. The filing states plainly that the device “may be used to measure a biosignal, for example, an electroencephalogram (EEG), for measuring brain activity,” which signals a clear intent to move brain monitoring into consumer wearables.
Electrooculography, or EOG, would let the earbuds detect eye movements through tiny electrical potentials generated by the eyes, turning eye motion into measurable signals. Electromyography, or EMG, would monitor the electrical activity of skeletal muscles and the nerves that control them, potentially revealing muscle activation patterns. Together these capabilities would allow the ear-worn device to infer a user’s physical actions and physiological state in fine detail.
The filing also covers heart-related signals: an electrocardiogram to monitor electrical heart activity and blood volume pulse to track heart rate and pulse dynamics. Galvanic skin response is listed too, measuring changes in skin conductance linked to sweat gland activity and driven by the autonomic nervous system. Those metrics are commonly used in stress, arousal, and fitness monitoring, but packing them into earbuds raises questions about scope and data sensitivity.
There is no single, explicit end use spelled out in the patent beyond demonstrating that these biosignals can be captured via an ear-worn array as an alternative to scalp or chest sensors. The filing focuses on measurement techniques, electrode layout, and algorithms for selecting electrodes, leaving the potential applications open to interpretation. What a company or third party might do with continuous streams of brain, eye, muscle, heart, and skin data is the real question users and regulators may soon need to answer.
