High-resolution audio has a higher temporal and/or depth resolution than compact disks (CDs). Several researchers have suggested that inaudible high -frequency components of highresolution audio might influence listeners' psychophysiological states. Two types of digital sound sources with the identical frequency structure (< 22 kHz) were created at different sampling rates (192 kHz and 44.1 kHz) by filtering out inaudible high -frequency components of an original sound source, which was an excerpt of natural environmental sounds recorded in 192 -kHz/24-bit format.Twenty-four university students listened to the three sounds in a random order for five minutes each. Results indicated that the 192-kHz sound source compared to the 44.1 -kHz sound source induced higher power in the theta (4.0 -8.0 Hz) and slow alpha (8.0-10.5 Hz) bands of the electroencephalogram. However, no apparent differences were found in sound quality or subjective mood. These results suggest that digital sound sources with a higher sampling frequency than CDs
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