Modality-Specific Effects on Discrimination of Short Empty Time Intervals

1979 ◽  
Vol 48 (3) ◽  
pp. 807-814 ◽  
Author(s):  
Shraga Hocherman ◽  
Gita Ben-Dov

The ability of human subjects to judge the duration of short empty time intervals was studied in relation to the modality composition of the marker signals. Ac each trial, a pair of empty intervals was presented by a series of three successive stimuli, and the subject was asked to point out the longer interval of the two. Tone pips and flashes of light were used as the bounding signals. All the possible combinations of auditory and visual stimuli were used, in random order, to delimit pairs of intervals. Performance was found modality-independent when the first two stimuli were of the same modality. Strong response biases were introduced by varying the modality of the first or the second stimulus. Analysis of these biases indicates that memorization of the empty time intervals is affected by the modality of the binding signals.

2007 ◽  
Vol 97 (5) ◽  
pp. 842-846 ◽  
Author(s):  
Jonathan M. Hodgson ◽  
Ian B. Puddey ◽  
Frank M. van Bockxmeer ◽  
Valerie Burke

Plasma total homocysteine concentrations (tHcy) are a putative risk factor for CVD. Tea is a rich dietary source of polyphenols and caffeine, both of which may raise tHcy. However, it is possible that much of any effect is transitory and may be influenced by the consumption of food. Our objective was to investigate the acute effect of tea, at a dose representative of ordinary population intakes, on tHcy and to determine whether consumption of a meal influences the magnitude of any effect. Measurements of tHcy were performed in twenty participants at baseline and 3.5 h after drinking three cups of black tea or hot water (consumed at time 0, 1.5 and 3 h) with and without a meal: a total of four treatments administered in random order. Drinking tea resulted in an acute increase in tHcy (0·30 (95 % CI 0·04, 0·56) μmol/l, P = 0·022). The meal resulted in an acute decrease in tHcy ( − 0·42 (95 % CI − 0·68, − 0·16) μmol/l, P = 0·002). There was no interaction between tea and meal on tHcy (P = 0·40); that is, the effect of tea on tHcy was not different in the fasting and non-fasting state. Our results suggest that drinking black tea can cause a small acute increase in tHcy and that this effect is not enhanced in the non-fasting state. Given that results of population studies have generally shown a negative association between tea intake and tHcy, the significance of these findings to CVD risk remains uncertain.


2006 ◽  
Vol 24 (1) ◽  
pp. 1-22 ◽  
Author(s):  
Gert Ten Hoopen ◽  
Takayuki Sasaki ◽  
Yoshitaka Nakajima ◽  
Ger Remijn ◽  
Bob Massier ◽  
...  

In a previous study, we presented psychophysical evidence that time-shrinking (TS), an illusion of time perception that empty durations preceded by shorter ones can be conspicuously underestimated, gives rise to categorical perception on the temporal dimension (Sasaki, Nakajima, & ten Hoopen, 1998). In the present study, we first survey studies of categorical rhythm perception and then describe four experiments that provide further evidence that TS causes categorical perception on the temporal dimension. In the first experiment, participants judged the similarity between pairs of /t1/t2/ patterns (slashes denote short sound markers delimiting the empty time intervals t1 and t2). A cluster analysis and a scaling analysis showed that patterns liable to TS piled up in a 1:1 category. The second and third experiments are improved replications in which the sum of t1 and t2 in the /t1/t2/ patterns is kept constant at 320 ms. The results showed that the 12 patterns /115/205/, /120/200/,  . . ., /165/155/, /170/150/ formed a 1:1 category. The fourth experiment utilizes a cross-modality matching procedure to establish the subjective temporal ratio of the /t1/t2/ patterns and a 1:1 category was established containing the 11 patterns /120/200/, /125/195/,  . . ., /165/155/, /170/150/. On basis of these converging results we estimate a domain of perceived 1:1 ratios as a function of total pattern duration (t1 + t2) between 160 and 480 ms. We discuss the implications of this study for rhythm perception and production.


2004 ◽  
Vol 2 (1) ◽  
pp. 305-316
Author(s):  
Krysytna Najder-Stefaniak

The paper presents the notion of human subjects. The author emphasizes the fact, that the thinking in ecological paradigm demand of own notion of the subject so as to substantiate the notion of responsibility and creative possibility of man. Autor state that in thinking the metaphor of an ecosystem is indispensable the notion of subjectivity fits in with the nation of man.


2021 ◽  
Vol 11 (3-4) ◽  
pp. 181-195
Author(s):  
Anetta Jedličková

Abstract The current coronavirus disease 2019 (COVID-19) pandemic has led to essential adjustments in clinical research involving human subjects. The pandemic is substantially affecting most procedures of ongoing, as well as new clinical trials related to diseases other than COVID-19. Procedural changes and study protocol modifications may significantly impact ethically salient fundamentals, such as the risk-benefit profile and safety of clinical trial participants, which raise key ethical challenges the subject-matter experts must face. This article aims to acquaint a wide audience of clinical research professionals, ethicists, as well as the general public interested in this topic with the legal, ethical and practical considerations in the field of clinical trials during the COVID-19 pandemic and to support the clinical researchers and study sponsors to fulfil their responsibilities in conducting clinical trials in a professional way that does not conflict with any legal or ethical obligations.


2001 ◽  
Vol 29 (4) ◽  
pp. 293-301 ◽  
Author(s):  
Douglas S. Grant
Keyword(s):  

2020 ◽  
Vol 14 (4) ◽  
pp. 219-238 ◽  
Author(s):  
Tai-Quan Peng ◽  
Yixin Zhou ◽  
Jonathan J. H. Zhu
Keyword(s):  

Author(s):  
Bronwyn Davies

This paper re-visits the problem of how we re-conceptualize human subjects within poststructuralist research. The turn to poststructuralist theory to inform research in the social sciences is complicated by the difficulty in thinking through what it means to put the subject under erasure. Drawing on a study in a Reggio Emilia inspired preschool in Sweden, and a study of neoliberalism's impact on academic work, this paper opens up thought about poststructuralism's subject. It argues that agency is the province of that subject. 


2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Cheng Xue ◽  
Antonino Calapai ◽  
Julius Krumbiegel ◽  
Stefan Treue

AbstractSmall ballistic eye movements, so called microsaccades, occur even while foveating an object. Previous studies using covert attention tasks have shown that shortly after a symbolic spatial cue, specifying a behaviorally relevant location, microsaccades tend to be directed toward the cued location. This suggests that microsaccades can serve as an index for the covert orientation of spatial attention. However, this hypothesis faces two major challenges: First, effects associated with visual spatial attention are hard to distinguish from those that associated with the contemplation of foveating a peripheral stimulus. Second, it is less clear whether endogenously sustained attention alone can bias microsaccade directions without a spatial cue on each trial. To address the first issue, we investigated the direction of microsaccades in human subjects while they attended to a behaviorally relevant location and prepared a response eye movement either toward or away from this location. We find that directions of microsaccades are biased toward the attended location rather than towards the saccade target. To tackle the second issue, we verbally indicated the location to attend before the start of each block of trials, to exclude potential visual cue-specific effects on microsaccades. Our results indicate that sustained spatial attention alone reliably produces the microsaccade direction effect. Overall, our findings demonstrate that sustained spatial attention alone, even in the absence of saccade planning or a spatial cue, is sufficient to explain the direction bias observed in microsaccades.


PMLA ◽  
1963 ◽  
Vol 78 (1) ◽  
pp. 8-14 ◽  
Author(s):  
James L. Rosier

The Beowulf Poet's extraordinary facility in using a vast and diverse word-hoard has long excited students of the poem. Among the critical studies, discussions of vocabulary rank high in number, and almost every conceivable approach to the subject has been investigated either in part or with a high degree of thoroughness. Single words, such as ealuscerwen, and groups of related words, such as rime-words, kennings, and words of Christian content or reference, have received close attention, as well as larger lexical patterns, such as variation and the formulaic texture, while further studies have compared the vocabulary with that of other Old English poems or Nordic literatures. Aside from purely lexicographical or etymological inquiries, there are three perspectives to which these many discussions generally belong: 1) descriptive: usually statistical observations about the number of compounds relative to simplices or of formulas relative to the whole vocabulary of the poem, or a comparison of the frequency of certain lexical types with other poems, or a classification of the habits of word-formation; 2) figurative and appellative: the types of verbal figures and their analogues elsewhere in Old English and Old Norse; and 3) usage: the use of words in particular contexts or for specific effects, and the structural use of synonymic substitution and variation. The first emphasis is important because it reveals the composition and its formative strata of the poem's total vocabulary, and also the lexical relationships with other poetry or poetic traditions. The second serves to isolate a lexical stratum which is by nature exclusively poetic and to observe how much of this stratum is probably original and how much traditional. But it is the third perspective which is interested most essentially in the poet, since here the attempt is made to discern the many ways by which he has used language significantly to dramatize, emphasize, elucidate, intimate, and so on. Much that has been written in this category has concerned itself with the larger patterns of variation as a characterizing, describing, or structural device, rather than with smaller, more confined, strokes of verbal association and verbal play. A well-known instance of the latter is the epithet for Grendel, healoegn (142) which, in its context, wherein a bona fide hall-thane anxiously seeks out a hiding place as protection against the intruder, may with complete justification be termed ironic, and the same thing may be said of a similar appellation used later for both Grendel and Beowulf, renweardas (770), There are also hints here and there that the poet may have been influenced by learned Latin figures. Many years ago Albert Cook compared flod blode weol (1422; Exodus 463, flod blod gewod) to Aldhelm's fluenta cruenta (De Virginitate, 2600), and more recently H. D. Meritt called attention to the similarity between Hrothgar's warning that in death “eagena bearhtm / forsiteo ond forsworces” (1766b-67a) and Aldhelm's “ferreus leti somnus palpebrarum conuolatus non tricaverit” (De Virg. Prose, 321.7, ed. Ewald). It is in the smaller strokes, I think, that the poet's acumen and craft are most incisively contained, and it is to some of these that the present discussion is devoted.


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