The task of deciding how long sensory events seem to last is one that the human nervous system appears to perform rapidly and, for sub-second intervals, seemingly without conscious effort. That these estimates can be performed within and between multiple sensory and motor domains suggest time perception forms one of the core, fundamental processes of our perception of the world around us. Given this significance, the current paucity in our understanding of how this process operates is surprising. One candidate mechanism for duration perception posits that duration may be mediated via a system of duration-selective ‘channels’, which are differentially activated depending on the match between afferent duration information and the channels' ‘preferred’ duration. However, this model awaits experimental validation. In the current study, we use the technique of sensory adaptation, and we present data that are well described by banks of duration channels that are limited in their bandwidth, sensory-specific, and appear to operate at a relatively early stage of visual and auditory sensory processing. Our results suggest that many of the computational principles the nervous system applies to coding visual spatial and auditory spectral information are common to its processing of temporal extent.
We investigated whether changes in low-level image characteristics, in this case spatial frequency, were capable of generating a well-known expansion in the perceived duration of an infrequent "oddball" stimulus relative to a repeatedly-presented "standard" stimulus. Our standard and oddball stimuli were Gabor patches that differed from each other in spatial frequency by two octaves. All stimuli were equated for visibility. Rather than the expected "subjective time expansion" found in previous studies, we obtained an equal and opposite expansion or contraction of perceived time dependent upon the spatial frequency relationship of the standard and oddball stimulus. Subsequent experiments using equi-visible stimuli reveal that mid-range spatial frequencies (ca. 2 c/deg) are consistently perceived as having longer durations than low (0.5 c/deg) or high (8 c/deg) spatial frequencies, despite having the same physical duration. Rather than forming a fixed proportion of baseline duration, this bias is constant in additive terms and implicates systematic variations in visual persistence across spatial frequency. Our results have implications for the widely cited finding that auditory stimuli are judged to be longer in duration than visual stimuli.
In the second edition of The Selfish Gene, Richard Dawkins included a short bibliometric analysis of key papers instrumental to the sociobiological revolution, the intention of which was to support his proposal that ideas spread within a population in an epidemiological manner. In his analysis, Dawkins primarily discussed the influence of an article by British evolutionary biologist William Donald Hamilton which had introduced the concept of “inclusive fitness”, and he argued that citations to it were accumulating in a very different manner to two other seminal papers, demonstrating the appearance and spread of a new “meme” in circles. This paper re-examines Dawkins’ original analysis and the conclusions drawn from it, and updates those conclusions based on citation data accumulated in the intervening three decades since . This updated analysis shows that patterns of citation for the three papers, and Dawkins’ book itself, are actually remarkably similar and show no qualitative difference in citation growth. The data are well described by a two-phase exponential model of citation growth in which citations accumulate rapidly and then saturate at a slower level of growth dictated primarily by the general increase in production. It is speculated that this two-phase exponential growth, with some modification to account for papers that are not immediately discovered, may be a signature that will help to reveal the emergence of genuinely novel ideas within the literature.
Purpose Meta reviews are central for mapping the state of the field, consolidating the heterogeneous public relations body of knowledge, and pointing to new potential research directions. Habermas is one of the most influential contemporary social theorists and his work has repeatedly been used in public relations scholarship. While some have maintained that his work has been most influential in the development of public relations theory, this stream of research has never been reviewed empirically. Design/methodology/approach In this paper, the authors present a bibliometric literature review of 263 public relations research articles published between 1980 and 2016 that cite and use Habermas’ work. A network analysis of these publications based on the technique of bibliographic coupling was used to identify common forms of application, research themes, as well as patterns of impact. Findings Results show that the use of Habermas has grown significantly, specifically in the recent decade. At the same time, researchers have a narrow focus specifically on earlier developments in the theory. Finally, we discover three main topical research clusters that have been influenced by the theory: public relations and the public sphere, dialogic stakeholder relationships, as well as public relations and communication ethics. Originality/value The findings map out an important stream of scholarship in the field by showing where public relations scholars have been and where the research community has not ventured yet. Based on the results of our analysis, the authors propose directions for research to advance future theory development in public relations using Habermas’ work.
Pairing a visual stimulus with a concurrent auditory stimulus of subtly longer or shorter duration expands or contracts the duration of that visual stimulus, even when the observer is asked to ignore the irrelevant auditory component. Here we map out this relationship and find a roughly linear relationship between perceived duration of the visual component and the duration of the irrelevant auditory component. Beyond this ‘window of integration’ the obligatory combination of cues breaks down rather suddenly, at durations 0.2 log units longer or shorter than baseline. Conversely, a visual duration has virtually no effect on the perceived duration of a concurrently presented auditory duration. A model is presented based on obligatory combination of visual and auditory cues within a window defined by the respective JNDs of vision and audition.
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