Table 1.

Summary of the mobile assessment battery.

Assessment	Functional Domain	Device(s)	Sensors	Data Elements	Sampling Interval
VSTM	Working memory	Smartphone	Phone screen	Trial type, response accuracy, and response time	Trial-by-trial
SDMT	Processing speed, working memory	Smartphone	Phone screen	Trial symbol, expected number, observed number, response accuracy, and trial duration	Trial-by-trial
Trails	Processing speed, executive function	Smartphone	Phone screen	Completion time, number of restarts, number of errors, sample time, detected screen position (x, y), nearest target, and target locations	Screen position change (23.9 ± 6.3 Hz; 8.1–54.2 Hz)
Finger Tapping	Psychomotor performance	Smartphone	Phone screen	Total taps, total alternating taps, tap time, tap location, tap duration, tap position (x, y), and tap-to-target distance	Each tap
Fine Motor	Psychomotor performance	Smartphone	Phone screen	Total completed, sample time, shape position (x, y), shape orientation, target position (x, y), and target orientation	Screen position change (10.5 ± 2.8 Hz; 1.9–23.4 Hz)
Phonation	Speech	Smartphone	Phone microphone	Speech duration, speech onset time, and raw signal (.wav)	32 kHz
Articulation	Diadochokinetic speech	Smartphone	Phone microphone	Speech duration, speech onset time, and raw signal (.wav)	32 kHz
Tremor	Postural stability and resting tremor	Smartwatch	Accelerometer, gyroscope, magnetometer, and compass	Acceleration (x, y, z), gravitational acceleration (x, y, z), orientation (roll, pitch, yaw), angular velocity (x, y, z), magnetic field (x, y, z), and heading	99.99 ± 0.5 Hz [82.5–100.8 Hz]
Gait and Balance	Gait and postural sway	Smartphone, Smartwatch	Accelerometer, gyroscope, magnetometer, and compass	Acceleration (x, y, z), gravitational acceleration (x, y, z), orientation (roll, pitch, yaw), angular velocity (x, y, z), magnetic field (x, y, z), and heading	Watch: 99.99 ± 0.5 Hz [82.5–100.8 Hz] Phone: 99.99 ± 0.5 Hz [99.2–100.8 Hz]

VSTM = visual short-term memory; SDMT = symbol digit modality test.