bluuebunny/crossref_metadata_2025_split huggingface dataset:
How do ectoparasitic nycteribiids locate their bat hosts?
Authors: LOURENÇO S. I. , PALMEIRIM J. M. 
Published: July 2008

SUMMARYNycteribiids (Diptera: Nycteribiidae) are specific haematophagous ectoparasites of bats, which spend nearly all their adult lives on hosts. However, females have to leave bats to deposit their larva on the walls of the roosts, where they later emerge as adult flies. Nycteribiids had thus to evolve efficient sensorial mechanisms to locate hosts from a distance. We studied the sensory cues involved in this process, experimentally testing the role of specific host odours, and general cues such as carbon dioxide, body heat, and vibrations. As models we used two nycteribiids (Penicillidia conspicua and Penicillidia dufourii) and their primary bat hosts (Miniopterus schreibersii and Myotis myotis, respectively). Carbon dioxide was the most effective cue activating and orientating the responses of nycteribiids, followed by body heat and body odours. They also responded to vibration, but did not orientate to its source. In addition, sensory cues combined (carbon dioxide and body heat) were more effective in orientating nycteribiids than either cue delivered alone. Results suggest that nycteribids have some capacity to distinguish specific hosts from a distance, probably through their specific body odours. However, the strong reliance of nycteribiids on cues combined indicates that they follow these to orientate to nearby multispecies bat clusters, where the chances of finding their primary hosts are high. The combination of sensory cues seems therefore an effective strategy used by nycteribiids to locate bat hosts at a distance.
Parasitization of a hydrothermal vent limpet (Lepetodrilidae, Vetigastropoda) by a highly modified copepod (Chitonophilidae, Cyclopoida)
Authors: TUNNICLIFFE V. , ROSE J. M. , BATES A. E. , KELLY N. E. 
Published: July 2008

SUMMARYThe limpetLepetodrilus fucensisMcLean is very abundant at hydrothermal vents on the Juan de Fuca and Explorer Ridges in the northeast Pacific Ocean. This limpet is parasitized by an undescribed chitonophilid copepod throughout the limpet's range. The parasite copepodite enters the mantle cavity and attaches to the afferent branchial vein. The initial invasive stage is a vermiform endosome within the vein that develops an extensive rootlet system causing an enlargement of the afferent branchial vein. Subsequently, an ectosomal female body grows outside the vein to sizes up to 2 mm in width. Once a dwarf male attaches, egg clusters form and nauplii are released. In over 3000 limpets examined from 30 populations, prevalence averaged about 5% with localized infections in female limpets over 25%. After the establishment of limpet populations at new vents, copepod prevalence increased over the succeeding months to 3 years. Host effects were marked and included castration of both sexes and deterioration in gill condition which affected both food acquisition and the gill symbiont. There was a significantly greater parasite prevalence in larger females which likely modifies the reproductive and competitive success of local host populations.
Lack of seasonal variation in the life-history strategies of the trematodeCoitocaecum parvum: no apparent environmental effect
Authors: LAGRUE C. , POULIN R. 
Published: July 2008

SUMMARYParasites with complex life cycles have developed numerous and very diverse adaptations to increase the likelihood of completing this cycle. For example, some parasites can abbreviate their life cycles by skipping the definitive host and reproducing inside their intermediate host. The resulting shorter life cycle is clearly advantageous when definitive hosts are absent or rare. In species where life-cycle abbreviation is facultative, this strategy should be adopted in response to seasonally variable environmental conditions. The hermaphroditic trematodeCoitocaecum parvumis able to mature precociously (progenesis), and produce eggs by selfing while still inside its amphipod second intermediate host. Several environmental factors such as fish definitive host density and water temperature are known to influence the life-history strategy adopted by laboratory raisedC. parvum. Here we document the seasonal variation of environmental parameters and its association with the proportion of progenetic individuals in a parasite population in its natural environment. We found obvious seasonal patterns in both water temperature andC. parvumhost densities. However, despite being temporally variable, the proportion of progeneticC. parvumindividuals was not correlated with any single parameter. The results show thatC. parvumlife-history strategy is not as flexible as previously thought. It is possible that the parasite's natural environment contains so many layers of heterogeneity thatC. parvumdoes not possess the ability to adjust its life-history strategy to accurately match the current conditions.
Genetic classification ofCryptosporidiumisolates from humans and calves in Slovenia
Authors: SOBA B. , LOGAR J. 
Published: July 2008

SUMMARYTo assess the importance of cattle as a source of human cryptosporidial infections in Slovenia,Cryptosporidiumisolates from calves and humans with cryptosporidiosis were characterized genetically by direct DNA sequencing, targeting a variable region of the 60 kDa glycoprotein (gp60) gene. In total, 15 genetic variants, designated ‘subtypes’, were identified, of which 7 were novel. In humans,C. hominisIa (subtype IaA17R3) and Ib (IbA10G2) andCryptosporidium parvumIIa (IIaA9G1R1, IIaA11G2R1, IIaA13R1, IIaA14G1R1, IIaA15G1R1, IIaA15G2R1, IIaA16G1R1, IIaA17G1R1 and IIaA19G1R1), IIc (IIcA5G3), and IIl (IIlA16R2) were recorded; this is the first record of the latter subtype in humans. In cattle,C. parvumIIa (IIaA13R1, IIaA15G2R1, IIaA16R1 and IIaA16G1R1) and IIl (IIlA16R2 and IIlA18R2) were recorded. Of the 15 subtypes identified, subtypes ofC. parvumIIa were the most frequently encountered (>90%) in both humans and calves. The present findings suggest that zoonotic transmission plays an important role in sporadic human cryptosporidiosis in Slovenia.
British Arctic whaling logbooks and journals: a provisional listing
Authors: Brown Sidney , Credland Arthur , Savours Ann , Stonehouse Bernard 
Published: July 2008

ABSTRACTThis paper lists accounts of whaling voyages to the Arctic from British ports, dating from the early 17th to early 20th centuries, that are available as logbooks, journals or publications for study in British, Canadian or United States public institutions. Included are all original whaling logbooks and journals located by the authors, mainly but not exclusively from previous listings, plus early publications by whaling masters, mates, surgeons and others in the trade containing details of particular voyages, and later accounts based on edited versions of holograph manuscripts. Records of whaling voyages are of intrinsic historical and sociological value, and many include data on weather and sea ice conditions that are of particular relevance to current studies of climatic variation.
‘Balloonacy’: Commander Cheyne's flight of fancy
Authors: Lewis-Jones Huw 
Published: July 2008

ABSTRACTCommander John P. Cheyne, R.N. (1826–1902) is a forgotten figure in the history of nineteenth-century polar exploration. A veteran of three expeditions in search of the missing Franklin expedition, his retirement was atypical of the many naval officers who had served in the Arctic. Late in 1876, after the disappointing return of the British Arctic expedition under George Strong Nares, Cheyne first announced his grand plans to reach the North Pole by balloon. He embarked on a transatlantic lecture tour in an effort to raise funds. It was a novel proposal that captured public imagination, but also drew wide criticism, and sometimes ridicule. This paper draws upon a study of primary and secondary materials: original manuscripts and correspondence, British and American newspapers and the illustrated press, souvenirs, pamphlets, and periodical reviews. This is a neglected episode in the history of polar exploration and in the history of aeronautics more generally, and it is a story of naivety and optimism, bravado and speculation. This paper examines the prevailing currents of public opinion of the value of exploration in this period, the debates surrounding new techniques of polar travel, and the changing image of the explorer. Both aeronautical pioneer and itinerant showman, Cheyne was increasingly maligned as a charlatan and lunatic. He proved unable to realise his dream of polar flight.
Human geographies of sea ice: freeze/thaw processes around Pangnirtung, Nunavut, Canada
Authors: Laidler Gita J. , Dialla Andrew , Joamie Eric 
Published: July 2008

ABSTRACTSea ice has been, and continues to be, an integral component of life in the Inuit community of Pangnirtung, Nunavut. Located in a fiord of the same name off the northeastern end of Cumberland Sound, extensive ice formation occurs within the fiord and the sound. This creates an important travel and hunting platform, and enables access to the coastlines of Cumberland Sound, hunting and fishing grounds, and nearby communities. With the combined importance, dynamism, and continuous use of this frozen ocean environment, local Inuit elders and hunters have developed a detailed and nuanced understanding of sea ice conditions, freeze/thaw processes, and the influences of winds and currents on ice conditions. Working collaboratively with the community of Pangnirtung since September 2003, we present the results of 30 semi-directed interviews, 5 sea ice trips, and 2 focus groups to provide a baseline understanding of local freezing processes (near-shore, open water, sea ice thickening, landfast ice, tidal cracks, and the floe edge), melting processes (snow melt, water accumulation and drainage, and break-up), wind influences on sea ice (wind direction and strength affecting sea ice formation and movement), and, current influences on sea ice (tidal variations and current strength affecting sea ice formation, movement, and polynya size/location). Strong emphasis is placed on Inuktitut terminology and spatial delineations of localised ice conditions and features. Therefore, this paper provides insights into local scale ice conditions and dynamics around Pangnirtung that are not captured in regional scale studies of Cumberland Sound and/or Davis Strait. As the third in a series of three papers on the same subject, but from different communities in the Qikiqtaaluk (Baffin) Region of Nunavut, this paper also provides a comparative summary of Inuktitut and scientific sea ice terminology along with an overview of the broader implications of results for collaborative science, education, and heritage initiatives.
A neural-symbolic perspective on analogy
Authors: Borges Rafael V. , Garcez Artur S. d'Avila , Lamb Luis C. 
Published: July 2008

AbstractThe target article criticises neural-symbolic systems as inadequate for analogical reasoning and proposes a model of analogy as transformation (i.e., learning). We accept the importance of learning, but we argue that, instead of conflicting, integrated reasoning and learning would model analogy much more adequately. In this new perspective, modern neural-symbolic systems become the natural candidates for modelling analogy.
The evolution of priming in cognitive competencies: To what extent is analogical reasoning adaptive?
Authors: Bouissac Paul 
Published: July 2008

AbstractThis commentary questions the general assumptions concerning the cognitive value of analogical reasoning on which the argument developed by Leech et al. appears to rest. In order to better assess the findings of their meta-analysis, it shifts the perspective from development to evolution, and frames their “how” concern within a broader “why” issue.
Analogy as relational priming: The challenge of self-reflection
Authors: Cheshire Andrea , Ball Linden J. , Lewis Charlie N. 
Published: July 2008

AbstractDespite its strengths, Leech et al.'s model fails to address the important benefits that derive from self-explanation and task feedback in analogical reasoning development. These components encourage explicit, self-reflective processes that do not necessarily link to knowledge accretion. We wonder, therefore, what mechanisms can be included within a connectionist framework to model self-reflective involvement and its beneficial consequences.
Toward extending the relational priming model: Six questions
Authors: Dietrich Eric 
Published: July 2008

AbstractSix questions are posed that are really specific versions of this question: How can Leech et al.'s system be extended to handle adult-level analogies that frequently combine concepts from semantically distant domains sharing few relational labels and that involve the production of abstractions? It is Leech et al. who stress development; finding such an extension would seem to have to be high on their priority list.
Developing structured representations
Authors: Doumas Leonidas A. A. , Richland Lindsey E. 
Published: July 2008

AbstractLeech et al.'s model proposes representing relations as primed transformations rather than as structured representations (explicit representations of relations and their roles dynamically bound to fillers). However, this renders the model unable to explain several developmental trends (including relational integration and all changes not attributable to growth in relational knowledge). We suggest looking to an alternative computational model that learns structured representations from examples.
Relational processing in conceptual combination and analogy
Authors: Estes Zachary , Jones Lara L. 
Published: July 2008

AbstractWe evaluate whether evidence from conceptual combination supports the relational priming model of analogy. Representing relations implicitly as patterns of activation distributed across the semantic network provides a natural and parsimonious explanation of several key phenomena observed in conceptual combination. Although an additional mechanism for role resolution may be required, relational priming offers a promising approach to analogy.
Analogy and the brain: A new perspective on relational primacy
Authors: Goswami Usha 
Published: July 2008

AbstractLeech et al.'s demonstration that analogical reasoning can be an emergent property of low-level incremental learning processes is critical for analogical theory. Along with insights into neural learning based on the salience of dynamic spatio-temporal structure, and the neural priming mechanism of repetition suppression, it establishes relational primacy as a plausible theoretical description of how brains make analogies.
Implicit analogy: New direct evidence and a challenge to the theory of memory
Authors: Greene Anthony J. 
Published: July 2008

AbstractThe authors propose that analogical reasoning may be achieved without conscious or explicit deliberation. The argument would be strengthened by more convincingly demonstrating instances of analogy that do not require explicit deliberation. Recent findings demonstrate that deliberative or explicit strategies are not necessary for flexible expression under novel circumstances (Greene et al. 2001) to include analogical transfer (Gross & Greene 2007). This issue is particularly critical because the existence of relational priming poses a serious challenge to the widely held notion that flexible expression of learned relations requires deliberative processes.
Neurocognitive process constraints on analogy: What changes to allow children to reason like adults?
Authors: Morrison Robert G. , Cho Soohyun 
Published: July 2008

AbstractAnalogy employs a neurocognitive working-memory (WM) system to activate and bind relational representations, integrate multiple relations, and suppress distracting information. Analogy experiments exploring these processes have used a variety of methodologies including dual tasks, neuropsychology, and functional neuroimaging, as well as experiments with children and older adults. Collectively, these experiments provide a rich set of results useful in evaluating any model of analogy and its development.
Relational priming plays a supporting but not leading role in adult analogy-making
Authors: Petrov Alexander A. 
Published: July 2008

AbstractLeech et al.'s analysis adds to an emerging consensus of the role of priming in analogy-making. However, their model cannot scale up to adult-level performance because not all relations can be cast as functions. One-size-fits-all accounts cannot capture the richness of analogy. Proportional analogies and transitive inferences can be made by nonstructural mechanisms. Therefore, these tasks do not generalize to tasks that require structure mapping.
Abstract analogies not primed by relations learned as object transformations
Authors: Phillips Steven 
Published: July 2008

AbstractAnalogy by priming learned transformations of (causally) related objects fails to explain an important class of inference involving abstract source-target relations. This class of analogical inference extends to ad hoc relationships, precluding the possibility of having learned them as object transformations. Rather, objects may be placed into momentarily corresponding, symbolic, source-target relationships just to complete an analogy.
Relation priming, the lexical boost, and alignment in dialogue
Authors: Raffray Claudine N. , Pickering Martin J. , Branigan Holly P. 
Published: July 2008

AbstractThe authors' claim that analogical reasoning is the product of relational priming is compatible with language processing work that emphasizes the role of low-level automatic processes in the alignment of situation models in dialogue. However, their model ignores recent behavioral evidence demonstrating a “lexical boost” effect on relational priming. We discuss implications of these data.
Child versus adult analogy: The role of systematicity and abstraction in analogy models
Authors: Schwering Angela , Kühnberger Kai-Uwe 
Published: July 2008

AbstractThe target article develops a computational connectionist model for analogy-making from a developmental perspective and evaluates this model using simple analogies. Our commentary critically reviews the advantages and limits of this approach, in particular with respect to its expressive power, its capability to generalize across analogous structure and analyze systematicity in analogies.
Analogy is to priming as relations are to transformations
Authors: Sloutsky Vladimir M. 
Published: July 2008

AbstractThe commentary discusses three components of the target proposal: (1) analogy as a host of phenomena, (2) relations as transformations, and (3) analogy as priming. The commentary argues that the first component is potentially productive, but it has yet to be fully developed, whereas the second and third components do not have an obvious way of accounting for multiple counterexamples.
Computational modeling of analogy: Destined ever to only be metaphor?
Authors: Speed Ann 
Published: July 2008

AbstractThe target article by Leech et al. presents a compelling computational theory of analogy-making. However, there is a key difficulty that persists in theoretical treatments of analogy-making, computational and otherwise: namely, the lack of a detailed account of the neurophysiological mechanisms that give rise to analogy behavior. My commentary explores this issue.
Computational complexity analysis can help, but first we need a theory
Authors: Wareham Todd , Rooij Iris van , Müller Moritz 
Published: July 2008

AbstractLeech et al. present a connectionist algorithm as a model of (the development) of analogizing, but they do not specify the algorithm's associated computational-level theory, nor its computational complexity. We argue that doing so may be essential for connectionist cognitive models to have full explanatory power and transparency, as well as for assessing their scalability to real-world input domains.
A unified framework for addiction: Vulnerabilities in the decision process
Authors: Redish A. David , Jensen Steve , Johnson Adam 
Published: July 2008

AbstractThe understanding of decision-making systems has come together in recent years to form a unified theory of decision-making in the mammalian brain as arising from multiple, interacting systems (a planning system, a habit system, and a situation-recognition system). This unified decision-making system has multiple potential access points through which it can be driven to make maladaptive choices, particularly choices that entail seeking of certain drugs or behaviors. We identify 10 key vulnerabilities in the system: (1) moving away from homeostasis, (2) changing allostatic set points, (3) euphorigenic “reward-like” signals, (4) overvaluation in the planning system, (5) incorrect search of situation-action-outcome relationships, (6) misclassification of situations, (7) overvaluation in the habit system, (8) a mismatch in the balance of the two decision systems, (9) over-fast discounting processes, and (10) changed learning rates. These vulnerabilities provide a taxonomy of potential problems with decision-making systems. Although each vulnerability can drive an agent to return to the addictive choice, each vulnerability also implies a characteristic symptomology. Different drugs, different behaviors, and different individuals are likely to access different vulnerabilities. This has implications for an individual's susceptibility to addiction and the transition to addiction, for the potential for relapse, and for the potential for treatment.
Vulnerabilities to addiction must have their impact through the common currency of discounted reward
Authors: Ainslie George 
Published: July 2008

AbstractThe ten vulnerabilities discussed in the target article vary in their likelihood of producing temporary preference for addictive activities – which is the phenomenon that puzzles conventional motivational theory. Direct dopaminergic stimulation, but probably not the other vulnerabilities, may contribute to the necessary concavity of addicts' delay discounting curves, as may factors that the senior author analyzes elsewhere. Whatever their origins, these curves can themselves account for temporary preference, sudden craving, and the “automatic” habits discussed here.
Addiction, procrastination, and failure points in decision-making systems
Authors: Andreou Chrisoula 
Published: July 2008

AbstractRedish et al. suggest that their failures-in-decision-making framework for understanding addiction can also contribute to improving our understanding of a variety of psychiatric disorders. In the spirit of reflecting on the significance and scope of their research, I briefly develop the idea that their framework can also contribute to improving our understanding of the pervasive problem of procrastination.
Computing motivation: Incentive salience boosts of drug or appetite states
Authors: Berridge Kent C. , Zhang Jun , Aldridge J. Wayne 
Published: July 2008

AbstractCurrent computational models predict reward based solely on learning. Real motivation involves that but also more. Brain reward systems can dynamically generate incentive salience, by integrating prior learned values with even novel physiological states (e.g., natural appetites; drug-induced mesolimbic sensitization) to cause intense desires that were themselves never learned. We hope future computational models may capture this too.
Impulsivity, dual diagnosis, and the structure of motivated behavior in addiction
Authors: Chambers R. Andrew 
Published: July 2008

AbstractDefining brain mechanisms that control and adapt motivated behavior will not only advance addiction treatment. It will help society see that addiction is a disease that erodes free will, rather than representing a free will that asks for or deserves consequences of drug-use choices. This science has important implications for understanding addiction's comorbidity in mental illness and reducing associated public health and criminal justice burdens.