Making sense of ‘on denoting’

The widely held assumption about what motivated On Denoting is irreconcilable with Russell's position shortly beforehand; but discarding it leaves one with a carefully worked out solution whose problem is missing. The real motivation is to be found in a notoriously obscure passage in OD, in which Russell exposes a decisive (though easily overlooked) flaw in his former theory of denoting; a flaw which also cripples Frege's theory of sense and reference. A comprehensive account of this passage is the chief concern of the present paper. Recognizing the critical role of this argument of Russell's leads to a more credible account of his argumentation in that essay. It also suggests that the fundamental standpoint underlyingThe Principles of Mathematics remains intact. In this light, the appropriation of OD to the philosophy of language may be misguided.     

Do common systems control eye movements and motion extrapolation?

People are able to judge the current position of occluded moving objects. This operation is known as motion extrapolation. It has previously been suggested that motion extrapolation is independent of the oculomotor system. Here we revisited this question by measuring eye position while participants completed two types of motion extrapolation task. In one task, a moving visual target travelled rightwards, disappeared, then reappeared further along its trajectory. Participants discriminated correct reappearance times from incorrect (too early or too late) with a two-alternative forced-choice button press. In the second task, the target travelled rightwards behind a visible, rectangular occluder, and participants pressed a button at the time when they judged it should reappear. In both tasks, performance was significantly different under fixation as compared to free eye movement conditions. When eye movements were permitted, eye movements during occlusion were related to participants' judgements. Finally, even when participants were required to fixate, small changes in eye position around fixation (<2°) were influenced by occluded target motion. These results all indicate that overlapping systems control eye movements and judgements on motion extrapolation tasks. This has implications for understanding the mechanism underlying motion extrapolation.     

The common rate control account of prediction motion

In prediction-motion (PM) tasks, people judge the current position of an occluded moving object. People can also judge the current number on an occluded digital counter or the current colour of an occluded colour-change display. These abilities imply that we can run mental simulations at a chosen speed, even without feedback from the senses. There is increasing evidence that the brain has a common rate control module for pacing all such dynamic mental simulations. The common rate control account of PM has more explanatory power than alternative accounts which emphasise the role of mental imagery or the oculomotor system. Finally, neuroimaging work suggests that the common rate controller is a part of a core timing network that incorporates basal ganglia circuitry.     

The interaction between duration, velocity and repetitive auditory stimulation

Repetitive auditory stimulation (with click trains) and visual velocity signals both have intriguing effects on the subjective passage of time. Previous studies have established that prior presentation of auditory clicks increases the subjective duration of subsequent sensory input, and that faster moving stimuli are also judged to have been presented for longer (the time dilation effect). However, the effect of clicks on velocity estimation is unknown, and the nature of the time dilation effect remains ambiguous. Here were present a series of five experiments to explore these phenomena in more detail. Participants viewed a rightward moving grating which traveled at velocities ranging from 5 to 15°/s and which lasted for durations of 500 to 1500 ms. Gratings were preceded by clicks, silence or white noise. It was found that both clicks and higher velocities increased subjective duration. It was also found that the time dilation effect was a constant proportion of stimulus duration. This implies that faster velocity increases the rate of the pacemaker component of the internal clock. Conversely, clicks increased subjective velocity, but the magnitude of this effect was not proportional to actual velocity. Through considerations of these results, we conclude that clicks independently affect velocity and duration representations.     

Implicit affective evaluation of visual symmetry

Symmetry and beauty are strongly linked, but is the positive response to visual symmetry automatic? We used the Implicit Association Test (IAT) to measure the valence of visual regularities in the absence of overt judgments. In our first experiment, participants classified dot patterns as random or having an axis of reflection, and words as positive or negative. When the same button was used to report reflection and positive words, responses were faster than when the same button was used to report reflection and negative words. We take this association to indicate an implicit preference for reflectional patterns. In subsequent experiments, a reflected pattern was preferred to a rotation or translation, and a rotational pattern was preferred to random patterns. In some cases these results were not in agreement with verbally reported preferences, but implicit preferences were always predicted by the speed at which patterns could be identified. We conclude that the IAT can unearth an automatic affective response produced by perceptual fluency. (PsycINFO Database Record (c) 2012 APA, all rights reserved).     

Rigid/non-rigid grounding and transitivity

While extant replies to Jonathan Schaffer’s putative counterexamples to the transitivity of grounding have made significant strides against the charge of transitivity failure, the replies pay insufficient attention to the common structure of the counterexamples, overlooking a deeper structural feature that contributes to their prima facie plausibility. Putative counterexamples to the transitivity of grounding, I argue, trade on the distinction between what I call ‘rigid’ and ‘non-rigid’ grounding, and confusion over how rigid and non-rigid grounding react when combined pumps the intuition that the counterexamples’ chained conclusions are false. The rigid/non-rigid grounding distinction also reveals plausible weakening inference rules that have been overlooked in treatments of the logic of grounding.     

Returning to the Religion of Abraham: Controversies over the Gafatar Movement in Contemporary Indonesia

This article explores the idea of ‘Milah Abraham’, a term used and advocated by Ahmad Mushaddeq and Mahful Muis, the founders of Gafatar (Gerakan Fajar Nusantara/Archipelagic Dawn Movement). Mahful Muis, a prominent companion of Mushaddeq, has written many works about the idea of the religion of Abraham. This article answers the questions of how the idea of Milah Abraham emerged, and what are the implications of its emergence in the context of plural Indonesian Islam. Based on interviews and the written works of both Gafatar leaders, this study explores the idea of the religion of Abraham and how it can go beyond Judaism, Christianity and Islam to a new spirituality that combines the three religious traditions. The idea of Milah Abraham not only offers a new syncretism in the context of plural Indonesian Islam, but also challenges the establishment of Islamic orthodoxy in the country. Since the 1970s, the idea of returning to the religion of Abraham has contributed to the discussion of pluralism among many Indonesian Muslim intellectuals.     

Paternal behavior in the spiny mouse (Acomys cahirinus)

The responsiveness of adult male spiny mice (Acomys cahirinus) to both their own and alien precocial young was investigated. Paternal behavior was manifested primarily by the males huddling with their offspring and the coordination of pup attendance between adult males and females. With less than 2 days exposure to their own neonates, males were found to discriminate between their own and alien young. Experience plays an important role in the development of paternal behavior in spiny mice. Males who have never had pups of their own sniff and attack unfamiliar neonates more than males who have fathered pups. The adaptive significance of paternal investment in this uniquely precocial murid rodent was discussed.     

Stigmatizing attitudes of the community towards people living with HIV/AIDS

This research involved an exploratory study in which a questionnaire was used to investigate the personal stigma and perceived community stigma regarding HIV/AIDS in a South African community. Student fieldworkers interviewed a convenient sample of 901 respondents from different races, gender and age groups, and found that respondents tended towards stigmatizing persons with HIV/AIDS. Yet, this degree of stigmatization was significantly less severe than the degree of stigmatization that respondents attributed to the community at large. Altogether 17% of the respondents had high stigmatizing attitudes, while 42% perceived the stigmatization by others in the community to be high. Race group, personal knowledge of someone with HIV, area of residence, gender and age group impacted on the respondents' personal tendency to stigmatize those with HIV/AIDS. The article discusses the difference between the level of personal stigma attached by the respondents and that perceived by them to be attached by the community. Attention is also paid to the possible implications of stigmatizing behaviour patterns and interventions on a community level. Copyright © 2006 John Wiley & Sons, Ltd.