The Influence of Binaural Room Impulse Responses on Externalization in Virtual Reality Scenarios

A headphone-based virtual sound image can not be perceived as perfectly externalized if the acoustic of the synthesized room does not match that of the real listening environment. This effect has been well explored and is known as the room divergence effect (RDE). The RDE is important for perceived externalization of virtual sounds if listeners are aware of the room-related auditory information provided by the listening environment. In the case of virtual reality (VR) applications, users get a visual impression of the virtual room, but may not be aware of the auditory information of this room. It is unknown whether the acoustic congruence between the synthesized (binaurally rendered) room and the visual-only virtual listening environment is important for externalization. VR-based psychoacoustic experiments were performed and the results reveal that perceived externalization of virtual sounds depends on listeners’ expectations of the acoustic of the visual-only virtual room. The virtual sound images can be perceived as externalized, although there is an acoustic divergence between the binaurally synthesized room and the visual-only virtual listening environment. However, the “correct” room information in binaural sounds may lead to degraded externalization if the acoustic properties of the room do not match listeners’ expectations.

Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams

Orbital-angular-momentum (OAM) multiplexing has been utilized to increase the channel capacity in both millimeter-wave and optical domains. Terahertz (THz) wireless communication is attracting increasing attention due to its broadband spectral resources. Thus, it might be valuable to explore the system performance of THz OAM links to further increase the channel capacity. In this paper, we study through simulations the fundamental system-degrading effects when using multiple OAM beams in THz communications links under atmospheric turbulence. We simulate and analyze the effects of divergence, turbulence, limited-size aperture, and misalignment on the signal power and crosstalk of THz OAM links. We find through simulations that the system-degrading effects are different in two scenarios with atmosphere turbulence: (a) when we consider the same strength of phasefront distortion, faster divergence (i.e., lower frequency; smaller beam waist) leads to higher power leakage from the transmitted mode to neighbouring modes; and (b) however, when we consider the same atmospheric turbulence, the divergence effect tends to affect the power leakage much less, and the power leakage increases as the frequency, beam waist, or OAM order increases. Simulation results show that: (i) the crosstalk to the neighbouring mode remains < − 15 dB for a 1-km link under calm weather, when we transmit OAM + 4 at 0.5 THz with a beam waist of 1 m; (ii) for the 3-OAM-multiplexed THz links, the signal-to-interference ratio (SIR) increases by ~ 5–7 dB if the mode spacing increases by 1, and SIR decreases with the multiplexed mode number; and (iii) limited aperture size and misalignment lead to power leakage to other modes under calm weather, while it tends to be unobtrusive under bad weather.

The Self-Other Divergence Effect for Doping Likelihood: Mediation by Guilt and Moderation by Moral Agency and Values

Objectives: Self–other divergence refers to individuals judging themselves to be different from others. The authors investigated doping-related self-other divergence.Design: The authors used a quasi-experimental repeated-measures design to compare the effects of an independent variable (perspective: self, other) on doping likelihood and guilt. Method: Rugby players rated doping likelihood and guilt in situations describing two perspectives: self (their own behavior and feelings) and other (another player’s behavior and feelings). They also completed measures of moral agency, identity, perfectionism, and values (moral traits). Results: Doping likelihood was lower and guilt was higher for self-based ratings compared with other-based ratings. The self–other difference in doping likelihood was mediated by guilt and moderated by moral traits (larger for athletes with higher agency and values). Agency and values were more strongly related to self than other doping likelihood. Conclusions: Other-referenced measures differed from self-referenced measures of doping likelihood and guilt, indicating that it is wrong to presume equivalence of measurement.

The Xbox/Kinect use in poststroke rehabilitation settings: a systematic review

ABSTRACT Background: Active games based on virtual reality have been widely used in the rehabilitation of many clinical conditions. However, studies on the use of Xbox/Kinect are rare, and technology application in stroke treatment is not clear yet. Objective: To verify the outcomes (O) analyzed in randomized controlled trials (C; S) that investigated the use of Xbox/Kinect (I) in patients with stroke (P). Methods: This is a systematic literature review that meets PRISMA standards and the eligibility criteria according to the PICOS strategy. The search procedure was performed by two researchers. The research strategy was repeated in case of divergence. Effect size was calculated by Cohen's formula and Hopkins rank. The risk of individual bias was assessed using PEDro Score and Higgins Classification. Results: The main outcomes were postural balance and activities of daily living, with four studies addressing these variables. However, only one study showed the effect of Xbox/Kinect intervention on balance as large, as in two other studies evaluating manual dexterity and depression, respectively. Conclusion: The greater use of Xbox/Kinect in treating patients after stroke is in recovery of balance and motor function, and the evidence support its application. These findings enable the use of virtual reality technology through Xbox/Kinect in rehabilitation programs, focusing on postural balance and motor skills. However, conclusive results are still not possible. Therefore, caution in the use of this technology is required.

Auditor choice in private firms: a stakeholders perspective

Purpose This paper aims to examine whether a private firm’s demand for a Big4 auditor is influenced by the auditor choice of its main supplier, customer and competitor. The authors rely on institutional theory to explain this stakeholders’ influence. The authors also examine whether the extent to which the firm’s board of directors engages in networking moderates this influence. Design/methodology/approach Questionnaire data are combined with archival data of 210 Belgian private firms with a statutory audit requirement. Logistic regression analysis is applied to examine to what extent firms follow their main competitor, customer and supplier in hiring a Big4 auditor. Findings The results reveal a positive association between the firm’s choice of a Big4 auditor and its main supplier being audited by a Big4 auditor, supporting the conformance effect (isomorphism) toward suppliers as hypothesized by institutional theory. The extent of board networking, however, seems to weaken this effect. Toward competitors, a divergence effect instead of a conformance effect is found, which indicates the existence of competitive differentiation regarding auditor choice. Research limitations/implications While prior studies mainly focus on the agency relationships between shareholders, debtholders and managers to explain auditor choice, this study also takes into account the firm’s other main stakeholders by relying on institutional theory. Both the conformance effect toward suppliers as well as the divergence effect toward competitors provide interesting additional perspectives on why auditors are demanded, leading to interesting future research opportunities. Originality/value This paper fulfills an identified need to consider additional theories in explaining audit outcomes.

Sound change in an urban setting: Category instability of the palatal fricative in Berlin

The differential categorization of identical stimuli depending on the presence of a prime is described as a perceptual divergence effect. We examined whether native listeners of the Berlin vernacular of German categorized identical acoustic stimuli differently in the explicit context of the names of two different districts of Berlin, assuming that listeners infer social information and linguistic stereotypes based on the names of these neighborhoods (Kreuzberg vs. Zehlendorf). All listeners categorized natural acoustic stimuli with synthetic fricatives synthesized along a continuum ranging from /ç/ to /ʃ/ as either