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Oculomotor System

開催日 2014/9/11
時間 16:00 - 17:00
会場 Poster / Exhibition(Event Hall B)

Pupillary Response Reflects Subjective Salience of Sound

  • P1-164
  • Liao Hsin-I / Hsin-I Liao:1 木谷 俊介 / Shunsuke Kidani:1 米家 惇 / Makoto Yoneya:1 柏野 牧夫 / Makio Kashino:1 古川 茂人 / Shigeto Furukawa:1 
  • 1:NTTコミュニケーション科学基礎研究所 / NTT Communication Science Laboratories 

We have shown that pupillary response is modulated by auditory salience defined by a unique sound presented among the same repetitive sounds, i.e., the oddball paradigm (Liao et al., 2014, ARO). However, a direct link between pupillary response and subjective salience is lacking. In addition, sound samples were limited to pure tone or noise. In the current study, we examined whether pupillary response reflects subjective salience by using various sounds. Ten types of sounds were used including beep, bird sing, chirp, crying, dog barking, laughter, phone ringing, scratch, tone, and noise. Each sound was presented diotically for 500 ms, and the inter-stimulus-interval was 10 secs. All the sounds had a-weighted sound pressure levels of 65 dB. Participants were not involved in any task but just listened to the sound sequence while their pupillary response was recorded. In a separate session, participants performed subjective pairwise-comparison tasks on the sounds in the following aspects: salience, loudness, annoyance, preference, beauty, hardness, and vigorousness. The judgment results were used to derive the Thurston rating scale for each aspect. Sound-induced pupil dilation was observed for all types of the sounds, replicating our previous findings. Importantly, pupil dilation differed among the sounds we tested, and positively correlated with the subjective rating of salience, loudness, and vigorousness. Pupil dilation also negatively correlated with the rating of beauty. No significant correlation was found between pupil dilation and preference, annoyance, or hardness. In sum, pupillary response to auditory stimulation reflects sound properties, which covariate with the subjective salience judgment of the sounds, as well as loudness, vigorousness, and beauty.

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