Source localization of brain electrical activity while listening to high-resolution digital sounds with inaudible high-frequency components

Kuribayashi, Ryuma; Nittono, Hiroshi

doi:10.1016/j.ijpsycho.2014.08.796

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, high-resolution audio with inaudible high-frequency components would be advantageous compared to a similar digital audio in which these components are removed, in terms of the enhanced brain activity. Kuribayashi and Nittono (2014) have localized the intracerebral sources of this alpha EEG effect using standardized low-resolution brain electromagnetic tomography (sLORETA). The analysis revealed that the difference between full-range and high-cut sounds appeared in the right inferior temporal cortex, whereas the main source of the alpha-band activity was located in the parietal-occipital region.…”

Section: Discussionmentioning

confidence: 99%

High-Resolution Audio with Inaudible High-Frequency Components Induces a Relaxed Attentional State without Conscious Awareness

Kuribayashi

Nittono

2017

Front. Psychol.

Self Cite

View full text Add to dashboard Cite

High-resolution audio has a higher sampling frequency and a greater bit depth than conventional low-resolution audio such as compact disks. The higher sampling frequency enables inaudible sound components (above 20 kHz) that are cut off in low-resolution audio to be reproduced. Previous studies of high-resolution audio have mainly focused on the effect of such high-frequency components. It is known that alpha-band power in a human electroencephalogram (EEG) is larger when the inaudible high-frequency components are present than when they are absent. Traditionally, alpha-band EEG activity has been associated with arousal level. However, no previous studies have explored whether sound sources with high-frequency components affect the arousal level of listeners. The present study examined this possibility by having 22 participants listen to two types of a 400-s musical excerpt of French Suite No. 5 by J. S. Bach (on cembalo, 24-bit quantization, 192 kHz A/D sampling), with or without inaudible high-frequency components, while performing a visual vigilance task. High-alpha (10.5–13 Hz) and low-beta (13–20 Hz) EEG powers were larger for the excerpt with high-frequency components than for the excerpt without them. Reaction times and error rates did not change during the task and were not different between the excerpts. The amplitude of the P3 component elicited by target stimuli in the vigilance task increased in the second half of the listening period for the excerpt with high-frequency components, whereas no such P3 amplitude change was observed for the other excerpt without them. The participants did not distinguish between these excerpts in terms of sound quality. Only a subjective rating of inactive pleasantness after listening was higher for the excerpt with high-frequency components than for the other excerpt. The present study shows that high-resolution audio that retains high-frequency components has an advantage over similar and indistinguishable digital sound sources in which such components are artificially cut off, suggesting that high-resolution audio with inaudible high-frequency components induces a relaxed attentional state without conscious awareness.

show abstract

Section: Discussionmentioning

confidence: 99%