Aging Effect of Audiovisual Integration under Different Stimuli Conditions

Yang Weiping, Yang Xiangfu, Li Shengnan

Journal of Psychological Science ›› 2023, Vol. 46 ›› Issue (4) : 848-856.

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Journal of Psychological Science ›› 2023, Vol. 46 ›› Issue (4) : 848-856. DOI: 10.16719/j.cnki.1671-6981.20230411
General Psychology, Experimental Psychology & Ergonomics

Aging Effect of Audiovisual Integration under Different Stimuli Conditions

  • Yang Weiping1,2, Yang Xiangfu1, Li Shengnan1
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Abstract

The process of combining visual and auditory signals into a unified and stable perception is called audiovisual integration. Compared to single sensory information, audiovisual information could improve the probability and speed of correct recognition of stimuli. However, it remains unclear whether audiovisual integration is greater in older adults than in younger adults. Moreover, the stimulus types have an effect on the audiovisual integration. Considering the decreases in perceptual ability and processing speed associated with aging, the underlying mechanisms may be different in the conditions of various stimuli. Therefore, it is needed to further investigate the audiovisual integration of older people across different stimuli conditions.
The present study examined the audiovisual integration in older and younger adults under three different conditions. Experiment 1 used static simple stimuli, Experiment 2 used dynamic hand-held tools, and Experiment 3 used dynamic speech stimuli. Each experiment contained target and standard stimuli and 300 trials, with 60 target stimuli and 240 standard stimuli. The stimuli presentation contained visual, auditory, and audiovisual modalities and were presented randomly to the subjects. Subjects were required to respond both quickly and accurately to the target stimuli with a keystroke (left mouse button) and the standard stimuli without a keystroke. The experiment used a mixed design of 2 (age: younger adults, older adults) × 3 (modality: visual, auditory, audiovisual), where age was a between-subject variable and modality was a within-subject variable. A mixed-measures ANOVA was applied to the response times and hit rates of Experiments 1, 2, and 3, respectively. The audiovisual integration was further calculated using the race model inequality (RMI). Subsequently, a longitudinal comparison of different stimulus conditions was conducted to verify the stimulus dependence of audiovisual integration in older adults.
It was found that in the static simple stimulus condition (Experiment 1), there was no significant difference between the audiovisual integration of older and younger adults. In the dynamic hand-held tool (Experiment 2) and dynamic speech stimulus conditions (Experiment 3), the audiovisual integration of older adults was greater than that of younger adults, and the time window of audiovisual integration in older adults was later than that in younger adults. The comparison of stimulus conditions revealed that dynamic handheld tools of audiovisual integration were greatest in younger and older adults. Furthermore, the integration time window in older adults changed with different stimulus conditions.
In summary, the processing of audiovisual integration in older adults in the static simple stimulus condition was similar to that of younger adults. However, in the dynamic hand-held tool and dynamic speech stimulus conditions, older adults preferred to use cross-modality information, indicating a strong stimulus dependence of audiovisual integration in older adults.

Key words

aging effect / stimuli condition / audiovisual integration / race model

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Yang Weiping, Yang Xiangfu, Li Shengnan. Aging Effect of Audiovisual Integration under Different Stimuli Conditions[J]. Journal of Psychological Science. 2023, 46(4): 848-856 https://doi.org/10.16719/j.cnki.1671-6981.20230411

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