NeckSense: A Multi-Sensor Necklace for Detecting Eating Activities in Free-Living Conditions.

We present the design, implementation, and evaluation of a multi-sensor, low-power necklace, , for automatically and unobtrusively capturing fine-grained information about an individual's eating activity and eating episodes, across an entire waking day in a naturalistic setting. fuses and classifies the proximity of the necklace from the chin, the ambient light, the Lean Forward Angle, and the energy signals to determine chewing sequences, a building block of the eating activity. It then clusters the identified chewing sequences to determine eating episodes.