State assessment system and methods of use

A method of training a physiology/state model for use to determine a state of a subject based on a physiological data of the subject, the method comprising:

• defining a state of the subject as an attention measure and a workload measure;
• defining the physiological data as a neural activation of the subject;
• placing a sensor on the subject to measure the neural activation of the subject;
• defining an objective relationship of the attention measure to the neural activation of the subject over a time period by performing a Continuous Performance Test (CPT) on the subject and measuring the neural activation of the subject over the time period;
• and
• defining an objective relationship of the workload measure to the neural activation of the subject over a second time period by performing an n-back task on the subject and measuring the neural activation of the subject over the second time period.

A state assessment system configured to determine a state of a subject, the state assessment system comprising:

• a physiological sensor comprising an fNIRS sensor configured to communicate a physiological data of a subject;
• an additional sensor configured to communicate a cardiac data of the subject;
• an analytics subsystem configured to determine a state of the subject from the physiological data and the cardiac data;
• the fNIRS sensor comprises:
• one or more LED, and
• one or more photodetector;
• and
• the analytics subsystem comprises:
• a hemoglobin estimation module configured to determine a hemoglobin measure from the physiological data of the subject,
• a neurocognitive measure module configured to determine a neural activation measure from the hemoglobin measure,
• a heart rate measure module configured to determine a heart rate measure from the cardiac data of the subject,
• a physiology/state model configured to define a relationship between the neural activation measure and a cognitive state measure,
• a cognitive state measure module configured to determine the state of the subject based on the cognitive state measure and the heart rate measure, and
• the state of the subject comprises an objective measure of one of the group of objective measures consisting of:
• a vigilance measure,
• a response inhibition measure, and
• a resilience measure.