SPEECH-DISCRIMINATION-ABILITY EVALUATION SYSTEM, SPEECH-DISCRIMINATION-ABILITY EVALUATION METHOD, AND PROGRAM

摘要

It is made possible to determine a speech discrimination ability of a user width a high precision. From an electroencephalogram signal of a user, a speech discrimination ability determination system acquires: an event-related potential based on a point of outputting a first speech sound being output with a first occurrence frequency as a starting point; an event-related potential based on a point of outputting the first speech sound being output with a second occurrence frequency as a starting point; an event-related potential based on a point of outputting a second speech sound being output with the first occurrence frequency as a starting point; and an event-related potential based on a point of outputting the second speech sound being output with the second occurrence frequency as a starting point. With respect to each of the first and second speech sounds, an MMN determination section acquires difference information between the event-related potential acquired during its output with the first occurrence frequency and the event-related potential acquired during its output with the second occurrence frequency, and determines whether a negative component exists in the difference information in predetermined time ranges after the first and second speech sounds are output. When the determination result indicates that the negative component exists, a discrimination ability determination section determines that the user discriminates the first and second speech sounds.