Subjects: Psychology >> Cognitive Psychology submitted time 2023-12-05
Abstract： To establish a stable and sensitive experience of the world, the brain tends to use recent history when forming perceptual decisions. This results in serial dependence in perception, by which previous trials affect the current perception. The serial dependence effect can be divided into (at least) two categories: the effect of previous stimuli (i.e., the stimulus serial dependence effect) and the effect of previous decisions (i.e., the decisional serial dependence effect) on the current perception. Although separate stimulus and decisional serial dependence effects have been demonstrated in duration perception, their spatial selectivity is unclear. In the present study, we investigated whether and how serial dependence in duration perception generalizes across different visual positions of stimuli.
The modified temporal bisection task was used in three experiments. Specifically, 24 naïve volunteers participated in Experiment 1. During the experiment, the visual stimulus (a white Gaussian blob) was pseudorandomly presented in the central or peripheral (10° from the left fixation) visual field. Participants were asked to judge whether the duration of the test stimulus (i.e., 300, 395, 520, 684, or 900 ms) was shorter or longer than a reference stimulus of intermediate duration (i.e., 520 ms) once the test stimulus disappeared. A group of 23 new volunteers were recruited for Experiment 2. The task of Experiment 2 was similar to that of Experiment 1, except that the visual stimulus was pseudorandomly located at either 5° to the left or 5° to the right of the central fixation. A new set of 24 volunteers participated in Experiment 3, in which the positions of both the fixation and the visual stimulus were changed; there were thus four types of positional relationships between stimuli across trials (i.e., identity, retinal position change, external position change, and both changes).
The results showed that previous stimulus duration and previous choice exerted opposing effects on serial dependence of duration perception: specifically, a repulsive stimulus serial dependence and an attractive decisional serial dependence. In other words, current duration estimates were repelled away from the previous trial’s stimulus duration but attracted toward the previous choice. We found these effects in both the central and peripheral visual fields. More importantly, we found that the stimulus serial dependence effect was not constrained by the visual position of the stimuli: the effects were comparable between contexts in which the stimulus positions of previous and current trials were the same and when they were different. The effects fully transferred across the central and peripheral visual fields, across the left and right visual hemifields, and across different external spaces. However, we found that the decisional serial dependence effect was larger in the position-consistent context than in the position-inconsistent context. This indicates that the decisional serial dependence effect could only be partially transferred across different visual positions regardless of the types of positions (i.e., spatiotopic vs. retinotopic).
These results provide evidence that both previous stimuli duration and previous choices affect subsequent perceptual decisions about duration, resulting in repulsive and attractive serial dependence effects, respectively. The repulsive stimulus serial dependence effect fully generalizes across different visual positions, suggesting it occurs primarily in higher-level visual areas. This also implies the existence of fast-duration adaptation. The attractive decisional serial dependence effect suggests that there is decision inertia in perceptual choices. Moreover, this effect is partly contingent on the visual position, which may result from the category organization function of higher-order brain areas. This suggests that the brain takes advantage of the visual position context when forming the decisional prior. These findings are helpful for understanding the plasticity of duration perception.
Subjects: Psychology >> Social Psychology submitted time 2023-03-27 Cooperative journals: 《心理学报》
Abstract： Distance compression in virtual reality (VR), which will lead to a distortion of fine manipulation in practical application, depicts that people tend to underestimate the spatial distance of visual stimuli in virtual environments. The apparent perceived differences between virtual and real environments break the immersive experiences and lower users' acceptance. Therefore, it is crucial to ameliorate the distance compression to increase the fidelity and ultimately promote the wider application of VR. Capitalizing on the fact that distance compression is a multiple modality phenomenon and occurs for auditory and visual stimuli, researchers reported that the distance judgment in VR would get more accurate when the positions of auditory and visual stimuli were incongruent. However, it is unclear to what extent the incongruency is to get effective amelioration. In this study, we aimed to completely examine the effect of the auditory stimulus on distance compression in VR. We presumed that the larger the incongruency was, the better amelioration obtained. We used the HTC Vive Pro to render the virtual environment and the build-in headphone to present auditory stimulus. Thirty participants were recruited to perform a distance judgment task. We first controlled the presence or absence of the auditory stimulus. We also varied the egocentric distance of visual stimulus (3 m, 4 m, 5 m). Then, we controlled the incongruency of the audio-visual condition, that is, the exocentric distance between auditory and visual stimuli (0.5 m, 1 m, 1.5 m, 2 m). Each block consisted of 30 consecutive trials, wherein the reference visual stimulus was presented at the beginning 5 s. Participants were asked to judge whether the following adjust stimulus was nearer or farther than the reference stimulus. The egocentric distance would be adjusted according to the response of the prior trial. The egocentric distance of the adjust stimulus in the last trial was referred to as the ultimate distance judgment for the initial reference stimulus. We found that the auditory stimulus affected the distance compression in two ways. First, the distance compression under the audio-visual condition was smaller than that under the visual-only condition (F(1, 29) = 4.05, p = 0.054, ηp2 = 0.12), especially when the egocentric distance of the visual stimulus was large (4 m: difference = 1.8%, t = ?1.59, df= 29, p = 0.062; 5 m: difference = 1.6%, t = ?1.85, df = 29, p = 0.037). Second, we formulated the relationship between the exocentric distance between auditory and visual stimuli and the distance compression rate, which was calculated by subtracting the perceived egocentric distance from the physical egocentric distance and then dividing it by the physical egocentric distance.: distance compression rate = ?0.024 × exocentric distance + 0.056. The slope was significant (p = 0.008), indicating the distance compression rate was negatively correlated with the exocentric distance and could be ameliorated at a pace of 2.4% for every 1 m. The adjusted R2 was 90.7%. We reported the effect of auditory stimulus on the distance compression in VR. Based on our results, we highly recommended presenting the auditory and visual stimuli simultaneously in the time domain and a minimum of 1 m apart in the space domain to ameliorate the distance compression in VR.
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