Shrinkage in the perceived duration of speech and tone by acoustic replacement1

Abstract: To investigate mechanisms for perceiving the duration of an auditory event, an effect of perceptual grouping upon perceived duration was studied psychophysically. In the first experiment, the perceived duration of a spoken word was measured under three conditions of acoustic continuity (i.e., (a) intact, (b) noise‐replaced, and (c) gap‐replaced) as a function of the duration of the target stimulus. Under the noise‐replaced condition, a portion of the target stimulus was physically replaced with a noise burst. Under the gap‐replaced condition, the replacement was made with a gap. The gap‐replacement resulted in a prominent shrinkage of the perceived duration. In the case of noise‐replacement, the amount of shrinkage was moderate but highly significant, although the word employed was perceived to be phonetically intact. Independent of this effect of replacement, the amount of shrinkage was also affected by the physical duration of the target stimulus. The second experiment tested an effect of noise replacement on the perceived duration of a tone burst. In this case, the noise replacement also shrunk the perceived duration of the non‐speech stimulus. This noise‐induced shrinkage could be regarded as being general for the auditory duration. The phenomenon is discussed in relation to a revised model for perceived duration.     

Experience and Theory

N. R. Hanson's discussion of experience is criticized. Experience, though necessary for knowing, is insufficient as a basis for understanding in either science or religion. Experience alone can be misleading. We may begin with experience, but we cannot claim to understand until experience has been mediated by theory. The article is excerpted from Metaphoric Process: The Creation of Scientific and Religious Understanding (Gerhart and Russell 1984), Chapter 2.     

Intersensory Redundancy Guides the Development of Selective Attention, Perception, and Cognition in Infancy

Abstract— That the senses provide overlapping information for objects and events is no extravagance of nature. This overlap facilitates attention to critical aspects of sensory stimulation, those that are redundantly specified, and attenuates attention to nonredundantly specified stimulus properties. This selective attention is most pronounced in infancy and gives initial advantage to the perceptual processing of, learning of, and memory for stimulus properties that are redundant, or amodal (e.g., synchrony, rhythm, and intensity), at the expense of modality-specific properties (e.g., color, pitch, and timbre) that can be perceived through only one sense. We review evidence supporting this hypothesis and discuss its implications for theories of perceptual, cognitive, and social development.     

A social validation explanation for mutual enhancement

Group members experience mutual enhancement when they evaluate one another’s task capabilities more positively because they are discussing shared as compared to unshared information. Two experiments investigated a social validation explanation for mutual enhancement. In Experiment 1, members of dyads read and discussed either shared or unshared information and collectively recalled this information under conditions where accuracy was important or not. Mutual enhancement occurred when need for accuracy was higher, but not when it was lower. In Experiment 2, members of dyads read validating or non-validating information from an outsider after they collectively recalled shared or unshared information. Members who discussed unshared information and received no validating communication from the outsider gave one another the lowest task capability ratings compared to members who discussed shared information and/or received validating communication from the outsider. All of these results are consistent with a social validation explanation for mutual enhancement.     

Different measures of risk perceptions yield different patterns of interaction for combinations of hazards: smoking,family history and cardiac events

Some combinations of hazards yield disease rates greater than would be expected from the risk attributable to each hazard in isolation. However, perceptions are often more consistent with the combined risk being seen as less than the sum of the individual factors, raising concerns over the validity of some measures of risk perception. Here, 249 adults estimated the risk of cardiac events for four hypothetical men, described as having high or low levels of smoking and family history of heart disease. Three distinct measures were used. A 9‐point scale produced a strong sub‐additive interaction, a 101‐point scale produced a weaker sub‐additive interaction, and an unbounded scale produced no interaction. In this study, as in all previous research, scales with relatively few points (here a 9‐point scale) yield sub‐additive interactions. Given the consistency of results yielded by such scales, irrespective of context, it is concluded that these scales are not valid for perceptions of multiple risk factors. Copyright © 2004 John Wiley & Sons, Ltd.     

自我知觉积极偏向的理论解释和意义分析

许多研究者注意到了人在进行自我知觉时的积极偏向,并提出各种观点对其进行解释和论证;许多实证研究也从不同侧面揭示了这种乐观偏向的适应意义。本文对相关内容进行了综合和梳理,介绍了自我增强的动机、自尊的需要和实现趋向等理论观点;并概括出这一积极偏向在提高行为动机和成就表现、消除不良情绪以及增进身心健康和社会适应等方面所具有的积极作用。     

视知觉无意识加工中的形状优势效应

研究了视知觉无意识加工中是否存在形状优势效应。被试为天津师范大学本科生60名。仪器为pentium lll高分辨率计算机．程序用E-prime心理实验软件系统编制而成。在实验1中,用信号检测论技术发现．当启动图形呈现时间为20ms时．被试是不能觉知到该图形的。在实验2和3中．被试的任务分别是判断图形的形状和颜色,用MANOVA分析启动图形对靶图形的启动效应时发现．启动图形的颜色线索不会影响靶图形的形状判断,但启动图形的形状线索却能抑制或促进靶图形的颜色判断。实验证据提示．在判断物体整体特征时,无意识知觉具有形状优势效应。     

Future Directions for Eye Movement Research

Eyemovementdatahaveproventobeex鄄tremelyusefulinthestudyofmanytopicsrelatedtocognitiveprocessing.Indeed,theymaybethebeston-linemeasureofmoment-to-momentcogni鄄tiveprocesses.Thisisnottosaythateyemove鄄mentswillproveusefulineveryaspectofcognitiveprocessing.Forexample,itisdifficulttoseehoweyemovementsmayrevealagreatdealaboutbasicmemoryprocesses(but,evenhere,theycouldbeusefulindeterminingexactlywhatpeoplerememberfromasceneorvisualdisplay).Inthisarticle,Iwillbrieflysummarizesomeimportantfindingsth…     

Color‐specific filtering of rival binocular inputs induced by priming1

Abstract: In a situation where the two eyes separately receive two dissimilar images such as a blue square and a red square, the brain is forced to resolve competitive interpretations of the visual inputs. Earlier studies have indicated that adaptation to one of two rival images can control the following competitive perception. Consistent with those studies, the present experiments revealed that immediately after a brief presentation of a color (priming stimulation) to the two eyes, subjects dominantly perceived the other color out of the chromatic rivalry. This effect showed an interocular transfer even if indirect monocular priming was employed, but the filtering out of a primed color did not occur when an unprimed rival image was removed from the other eye. These facts suggest that binocular feature‐detection processes in the human visual system might be responsible for the priming effect on rival images.     

Who wants privacy protection,and what do they want?

As privacy controversies have become more salient since the early 1980s, one response by policy makers has been to try to encourage consumers to demand privacy protection, by expecting goods and services to be designed with privacy‐enhancing technologies (PETs) embedded in them. But what scope is there for this? Conventional approaches to understanding consumer demand for privacy protection have not been very helpful in providing robust accounts of when consumers will want which kinds of protection. This paper offers a neo‐Durkheimian institutionalist theoretical account of the roots of consumer preferences for privacy and services with PETs in particular, which yields testable hypotheses for future research. It grounds preferences in risk perceptions, shows how distinct styles of risk perceptions are the result of distinct types of situation in social organisation, and derives typical demand curves for each of these types, before exploring the extent of mobility of preferences predicted by the theory, which in turn provides the basis for understanding the scope for persuading consumers to demand privacy‐respecting services of different types. Rooted in the sociology of knowledge and in anthropological approaches, the argument represents a challenge to psychometric, naïve empiricist and postmodernist accounts, and it offers a distinct research agenda. Copyright © 2002 Henry Stewart Publications Ltd.