• Authors: Misa Kobayashi, Makoto Ichikawa(小林美沙,一川誠)

• Title: Emotional response evoked by viewing facial expression pictures leads to higher temporal resolution

• Journal(書誌情報): i-Percetion

• doi:10.1177/20416695231152

• 論文URL: https://journals.sagepub.com/doi/10.1177/20416695231152144?fbclid=IwAR2Gt3Tti7W8jBUDK6C4ZBg_Se336qpz_4eAzZ_TtNb7OHjWQhozhPnULRQ

• Abstract:
We examined the effects of emotional response, with different levels of valence and arousal, on the temporal resolution of visual processing by using photos of various facial expressions. As an index of the temporal resolution of visual processing, we measured the minimum lengths of the noticeable durations for desaturated photographs using the method of constant stimuli by switching colorful facial expression photographs to desaturated versions of the same photographs. Experiments 1 and 2 used facial photographs that evoke various degrees of arousal and valence. Those photographs were prepared not only in an upright orientation but also in an inverted orientation to reduce emotional response without changing the photographs’ image properties. Results showed that the minimum duration to notice monochrome photographs for anger, fear, and joy was shorter than that for a neutral face when viewing upright face photographs but not when viewing inverted face photographs. For Experiment 3, we used facial expression photographs to evoke various degrees of arousal. Results showed that the temporal resolution of visual processing increased with the degree of arousal. These results suggest that the arousal of emotional responses evoked by viewing facial expressions might increase the temporal resolution of visual processing.

• 著者Contact先の email:
ms.kobayashi[at]chiba-u.jp([at]を@に変更してください。)
michikawa[at]chiba-u.jp([at]を@に変更してください。)

• 日本語によるコメント(オプション,200-300字で)
本研究では、さまざまな表情画像の観察で生じる感情反応が視覚処理の時間精度に及ぼす影響を検討するため、表情画像の彩度低下が検出される時間長閾値を恒常法で調べた。その結果、怒り,喜び,喜びの表情画像を正立状態で提示した場合、画像を観察することで感情反応が生じた際に視覚の時間精度が上昇すること、表情画像を倒立提示した場合、画像特性が変わらないにも関わらずこうした効果は認められなくなることが示された。さらに、時間精度の上昇を引き起こす感情はネガティブなものに限定されないことも見出された。実験結果は表情画像観察で喚起された感情覚醒度が視覚処理の時間精度を上昇させることを示唆した。