Brain activity measurement device, program, and method

A program for analyzing a signal from a deep brain region using three sensors attached to different locations on the surface of the head of a subject, at least one of the sensors being attached to the back of the head of the subject, the program being configured to cause a computer to execute a procedure comprising the steps of:

• extracting data from each of the three signals acquired by the sensors with a sampling period;
• calculating a correlation value indicative of a correlative relationship among the signals acquired from each respective sensors, based on a phase relationship among three pieces of time series data each extracted from the respective sensors;
• and
• analyzing the signals from the deep brain region, based on the calculated correlation value, to calculate an index value for determining a brain function.

A method for analyzing a signal from a deep brain region using three sensors attached to different locations on the surface of the head of a subject, at least one of the sensors being attached to the back of the head of the subject, the method comprising the steps of:

• extracting, from each of the three signals acquired from the sensors, a deep-brain potential signal having a specific frequency band arising from an activity of a deep brain region, and acquiring data from the extracted deep-brain potential signal with a sampling period;
• calculating a correlation value indicative of a correlative relationship among the deep-brain potential signals acquired from each respective sensors, based on a phase relationship among three pieces of time series data each extracted from the respective sensors;
• and
• analyzing the deep-brain potential signals from the deep brain region, based on the calculated correlation value, to calculate an index value for determining a brain function.