| 1. |
- Larsson, Pontus, 1974, et al.
(författare)
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Auditory-visual perception of room size in virtual environments
- 2007
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Ingår i: Proceedings of the 19th International Congress on Acoustics, September 2-7, 2007, Madrid, Spain. - 8487985122 ; , s. PPA-03-001-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- It is generally believed that the effectiveness of Virtual Environments (VEs) relies on their ability of faithfully reproducing the multisensory experience of the physical world. An important aspect of this experience is the perception of size and distance. In e.g. an architectural application it is of course of great interest that the user gets the correct impression of room size. However, considering visual perception VE it is yet not fully understood what system parameters control room size. Some investigations on auditory distance perception have been carried out, but there is also an obvious lack of research concerning auditory room size perception. In addition, it is far from understood how audition and vision interact when sensing an indoor environment. The current paper reviews an experiment aimed at exploring aspects of auditory, visual and auditory-visual room size perception in VEs. In line with previous research, it is found that people in general seem to underestimate room size when exposed to a visual VE. It is also shown that there seems to be a tendency to overestimate room size in auditory VEs, and finally that the combination of auditory and visual stimuli allows for a more accurate room size perception.
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| 2. |
- Riecke, B. E., et al.
(författare)
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Moving Sounds Enhance the Visually-Induced Self-Motion Illusion (Circular Vection) in Virtual Reality
- 2009
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Ingår i: ACM Transactions on Applied Perception. - : Association for Computing Machinery (ACM). - 1544-3558 .- 1544-3965. ; 6:2, s. 7 (artno)-
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Tidskriftsartikel (refereegranskat)abstract
- While rotating visual and auditory stimuli have long been known to elicit self-motion illusions ("circular vection"), audiovisual interactions have hardly been investigated. Here, two experiments investigated whether visually induced circular vection can be enhanced by concurrently rotating auditory cues that match visual landmarks (e. g., a fountain sound). Participants sat behind a curved projection screen displaying rotating panoramic renderings of a market place. Apart from a no-sound condition, headphone-based auditory stimuli consisted of mono sound, ambient sound, or low-/high-spatial resolution auralizations using generic head-related transfer functions (HRTFs). While merely adding nonrotating (mono or ambient) sound showed no effects, moving sound stimuli facilitated both vection and presence in the virtual environment. This spatialization benefit was maximal for a medium (20 degrees x 15 degrees) FOV, reduced for a larger (54 degrees x 45 degrees) FOV and unexpectedly absent for the smallest (10 degrees x 7.5 degrees) FOV. Increasing auralization spatial fidelity (from low, comparable to five-channel home theatre systems, to high, 5 degrees resolution) provided no further benefit, suggesting a ceiling effect. In conclusion, both self-motion perception and presence can benefit from adding moving auditory stimuli. This has important implications both for multimodal cue integration theories and the applied challenge of building affordable yet effective motion simulators.
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| 3. |
- Tajadura, Ana, 1979, et al.
(författare)
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Affective multimodal displays: Acoustic spectra modulates perception of auditory-tactile signals
- 2008
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Ingår i: International Conference of Auditory Dispaly, ICAD08, Paris, 2008..
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Konferensbidrag (refereegranskat)abstract
- Emotional events may interrupt ongoing cognitive processes and automatically grab attention, modulating the subsequentperceptual processes. Hence, emotional eliciting stimuli might effectively be used in warning applications, where a fast and accurate response from users is required. In addition, conveying information through an optimum multisensory combination can lead to a further enhancement of user responses. In the present study we investigated the emotional response to sounds differing in their acoustic spectra, and their influence on speeded detection of auditory-somatosensory stimuli. Higher soundfrequencies resulted in an increase in emotional arousal. We suggest that emotional processes might be responsible for the different auditory-somatosensory integration patterns observed for low and high frequency sounds. The presented results might have important implications for the design of auditory and multisensory warning interfaces.
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| 4. |
- Tajadura, Ana, 1979, et al.
(författare)
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Auditory–somatosensory multisensory interactions are spatially modulated by stimulated body surface and acoustic spectra
- 2009
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Ingår i: Neuropsychologia. - : Elsevier BV. - 0028-3932. ; 47:1, s. 195-203
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Tidskriftsartikel (refereegranskat)abstract
- Previous research has provided inconsistent results regarding the spatial modulation of auditory–somatosensory interactions. The present study reports three experiments designed to investigate the nature of these interactions in the space close to the head. Human participants made speeded detection responses to unimodal auditory, somatosensory, or simultaneous auditory–somatosensory stimuli. In Experiment 1, electrocutaneous stimuli were presented to either earlobe, while auditory stimuli were presented from the same versus opposite sides, and from one of two distances (20 vs. 70 cm) from the participant's head. The results demonstrated a spatial modulation of auditory–somatosensory interactions when auditory stimuli were presented from close to the head. In Experiment 2, electrocutaneous stimuli were delivered to the hands, which were placed either close to or far from the head, while the auditory stimuli were again presented at one of two distances. The results revealed that the spatial modulation observed in Experiment 1 was specific to the particular body part stimulated (head) rather than to the region of space (i.e. around the head) where the stimuli were presented. The results of Experiment 3 demonstrate that sounds that contain high-frequency components are particularly effective in eliciting this auditory–somatosensory spatial effect. Taken together, these findings help to resolve inconsistencies in the previous literature and suggest that auditory–somatosensory multisensory integration is modulated by the stimulated body surface and acoustic spectra of the stimuli presented.
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| 5. |
- Tajadura, Ana, 1979, et al.
(författare)
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Embodied auditory perception: The emotional impact of approaching and receding sound sources.
- 2010
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Ingår i: Emotion. - 1528-3542 .- 1931-1516. ; 10:2, s. 216-229
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Tidskriftsartikel (refereegranskat)abstract
- Research has shown the existence of perceptual and neural bias toward sounds perceived as sources approaching versus receding a listener. It has been suggested that a greater biological salience of approaching auditory sources may account for these effects. In addition, these effects may hold only for those sources critical for our survival. In the present study, we bring support to these hypotheses by quantifying the emotional responses to different sounds with changing intensity patterns. In 2 experiments, participants were exposed to artificial and natural sounds simulating approaching or receding sources. The auditory-induced emotional effect was reflected in the performance of participants in an emotion-related behavioral task, their self-reported emotional experience, and their physiology (electrodermal activity and facial electromyography). The results of this study suggest that approaching unpleasant sound sources evoke more intense emotional responses in listeners receding ones, whereas such an effect of perceived sound motion does not exist for pleasant or neutral sound sources. The emotional significance attributed to the sound source itself, the loudness of the sound, and loudness change duration seem to be relevant factors in this disparity.
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| 6. |
- Tajadura, Ana, 1979, et al.
(författare)
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Emotional bias for the perception of rising tones
- 2008
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Ingår i: 7th European Conference on Noise Control 2008, EURONOISE 2008; Paris; France; 29 June 2008 through 4 July 2008. - 2226-5147. ; , s. 1597-1602
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Konferensbidrag (refereegranskat)abstract
- Sounds with rising or falling intensity are often perceived as approaching or receding sound sources, respectively. Research has shown the existence of biases, both at perceptual and neural levels, in detecting and responding to approaching versus receding sounds. It has been suggested that these effects might account for a greater biological salience of approaching sounds. In the present study we investigated whether this asymmetry could be also explained by emotional theories. Participants were exposed to pairs of stimuli formed by an approaching or a receding sound, followed by a neutral, negative or positive photograph. They were required to make a speeded three-alternative forced choice (3AFC) task regarding how they felt when looking at the photographs. Reaction times (RTs) to this task and self-reported emotional ratings for the sounds were collected. In addition, participants' electrodermal activity and facial electromyography were measured as they listened to the sounds. Participants performed faster in the 3AFC task when photographs were preceded by approaching sounds, especially for photographs with negative content. Both the intensity range and slope of the sounds had a significant effect on RTs. Taken together, these results suggest that approaching sounds have a greater emotional power than receding ones.
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| 7. |
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| 8. |
- Tajadura, Ana, 1979, et al.
(författare)
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Self-representation in mediated environments: the experience of emotions modulated by auditory-vibrotactile heartbeat
- 2008
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Ingår i: CyberPsychology and Behavior. ; 11:1, s. 33-38
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Tidskriftsartikel (refereegranskat)abstract
- In 1890, William James hypothesized that emotions are our perception of physiological changes. Many different theories of emotion have emerged since then, but it has been demonstrated that a specifically induced physiological state can influence an individual’s emotional responses to stimuli. In the present study, auditory and/or vibrotactile heartbeat stimuli were presented to participants (N = 24), and the stimuli’s effect on participants’ physiological state and subsequent emotional attitude to affective pictures was measured. In particular, we aimed to investigate the effect of the perceived distance to stimuli on emotional experience. Distant versus close sound reproduction conditions (loudspeakers vs. headphones) were used to identify whether an “embodied” experience can occur in which participants would associate the external heartbeat sound with their own. Vibrotactile stimulation of an experimental chair and footrest was added to magnify the experience. Participants’ peripheral heartbeat signals, selfreported valence (pleasantness) and arousal (activation) ratings for the pictures, and memory performance scores were collected. Heartbeat sounds significantly affected participants’ heartbeat, the emotional judgments of pictures, and their recall. The effect of distance to stimuli was observed in the significant interaction between the spatial location of the heartbeat sound and the vibrotactile stimulation, which was mainly caused by the auditory-vibrotactile interaction in the loudspeakers condition. This interaction might suggest that vibrations transform the far sound condition (sound via loudspeakers) in a close-stimulation condition and support the hypothesis that close sounds are more affective than distant ones. These findings have implications for the design and evaluation of mediated environments.
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| 9. |
- Tajadura, Ana, 1979, et al.
(författare)
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Spatial modulation of auditory-somatosensory interactions: effects of stimulated body surface and acoustic spectra
- 2008
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Ingår i: International Multisensory Research Forum, IMRF08, Hamburg, 2008..
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Recent research on auditory-somatosensory interactions has shown contradictory results regarding the spatial modulation. In the present study we report on three experiments on auditory-somatosensory interactions in the region close to the head. Participants made speeded simple detection responses to single auditory, somatosensory or double simultaneous auditory-somatosensory stimuli. In Experiment 1, electrocutaneous stimuli were presented to either earlobe, while auditory stimuli were presented from the same versus different sides, and from one of two distances (20 or 70 cm) from the participant’s head. The results demonstrated a spatial modulation of auditory-somatosensory interactions, especially when auditory stimuli were presented from close to the head. Experiment 2, with electrocutaneous stimuli delivered to the hands (placed either close to, or far from, the participants’ head), suggests that the spatial modulation is dependent on the particular body part stimulated (head) rather than on the region of space (around the head) where the stimuli is presented. Experiment 3 showed that this auditory-somatosensory spatial effect occurs primarily for sounds containing high-frequency components. Taken together, these results suggest that the auditory-somatosensory multisensory integration might be facilitated by stimuli occurring at the same location, and that this integration is modulated by the stimulated body surface and acoustic spectra.
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| 10. |
- Tajadura, Ana, 1979, et al.
(författare)
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When Room Size Matters: Acoustic Influences on Emotional Responses to Sounds
- 2010
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Ingår i: Emotion. - : American Psychological Association (APA). - 1528-3542 .- 1931-1516. ; 10:3, s. 416-422
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Tidskriftsartikel (refereegranskat)abstract
- When people hear a sound (a "sound object" or a "sound event") the perceived auditory space around them might modulate their emotional responses to it. Spaces can affect both the acoustic properties of the sound event itself and may also impose boundaries to the actions one can take with respect to this event. Virtual acoustic rooms of different sizes were used in a subjective and psychophysiological experiment that evaluated the influence of the auditory space perception on emotional responses to various sound sources. Participants (N = 20) were exposed to acoustic spaces with sound source positions and room acoustic properties varying across the experimental conditions. The results suggest that, overall, small rooms were considered more pleasant, calmer, and safer than big rooms, although this effect of size seems to disappear when listening to threatening sound sources. Sounds heard behind the listeners tended to be more arousing, and elicited larger physiological changes than sources in front of the listeners. These effects were more pronounced for natural, compared to artificial, sound sources, as confirmed by subjective and physiological measures.
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