1. A method for determining whether a physiological sensor is properly positioned on a subject, the method comprising: receiving a light signal using the physiological sensor; processing, using processing equipment, the light signal to obtain a first signal corresponding to ambient light; processing, using the processing equipment, the light signal to obtain a second signal corresponding to an emitted photonic signal and ambient light; analyzing, using the processing equipment, the first signal and the second signal to identify similar signal amplitude behavior; and determining, using the processing equipment, that the physiological sensor is not properly positioned based on the analysis.