scholarly journals Mouth Pain in Horses: Physiological Foundations, Behavioural Indices, Welfare Implications, and a Suggested Solution

Animals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 572
Author(s):  
David J. Mellor

A proposition addressed here is that, although bitted horses are viewed by many equestrians as being largely free of bit-related mouth pain, it seems likely that most behavioural signs of such pain are simply not recognised. Background information is provided on the following: the major features of pain generation and experience; cerebrocortical involvement in the conscious experience of pain by mammals; the numerous other subjective experiences mammals can have; adjunct physiological responses to pain; some general feature of behavioural responses to pain; and the neural bases of sensations generated within the mouth. Mouth pain in horses is then discussed. The areas considered exclude dental disease, but they include the stimulation of pain receptors by bits in the interdental space, the tongue, the commissures of the mouth, and the buccal mucosa. Compression, laceration, inflammation, impeded tissue blood flow, and tissue stretching are evaluated as noxious stimuli. The high pain sensitivity of the interdental space is described, as are likely increases in pain sensitivity due to repeated bit contact with bruises, cuts, tears, and/or ulcers wherever they are located in the mouth. Behavioural indices of mouth pain are then identified by contrasting the behaviours of horses when wearing bitted bridles, when changed from bitted to bit-free bridles, and when free-roaming unbitted in the wild. Observed indicative behaviours involve mouth movements, head-neck position, and facial expression (“pain face”), as well as characteristic body movements and gait. The welfare impacts of bit-related pain include the noxiousness of the pain itself as well as likely anxiety when anticipating the pain and fear whilst experiencing it, especially if the pain is severe. In addition, particular mouth behaviours impede airflow within the air passages of the upper respiratory system, effects that, in their turn, adversely affect the air passages in the lungs. Here, they increase airflow resistance and decrease alveolar gas exchange, giving rise to suffocating experiences of breathlessness. In addition, breathlessness is a likely consequence of the low jowl angles commonly maintained during dressage. If severe, as with pain, the prospect of breathlessness is likely to give rise to anxiety and the direct experience of breathlessness to fear. The related components of welfare compromise therefore likely involve pain, breathlessness, anxiety, and fear. Finally, a 12-point strategy is proposed to give greater impetus to a wider adoption of bit-free bridles in order to avoid bit-induced mouth pain.

2020 ◽  
Author(s):  
Sarah Lynne Salvador Daway-Ducanes

Abstract This paper analyses the macroeconomic and welfare effects of a higher retirement age within a dynamic overlapping generations framework, wherein exponential discounting and sophisticated quasi-hyperbolic discounting agents coexist in ‘mixed economies’. The transitional dynamics of economic aggregates depend on the proportion of QHD agents, and the extent to which reducing the social security tax rate mitigates crowding-out effects on savings and enables both lower pension contributions and higher pension benefits. Welfare impacts across agent types and cohorts differ accordingly: QHD agents employ the higher retirement age as a commitment mechanism to mitigate the adverse welfare implications of present-biasedness.


2018 ◽  
Author(s):  
Roy Baumeister

Time is an important yet mysterious aspects of human conscious experience. We investigated time in everyday thoughts. Two community samples, contacted at random points for three (Study 1; 6,686 reports) and 14 days (Study 2; 2,361 reports), reported on their most recent thought. Both studies found that thoughts about the present and future were frequent, whereas thoughts about the past were rare. Thoughts about the present were common during social interaction, felt pleasant, but lacked to meaningfulness. Thoughts about the future included desires to satisfy goals and usually involved planning. Thoughts about the past were relatively unpleasant and involuntary. Subjective experiences of past and future thoughts often were similar and differed from present focus, consistent with views that memory and prospection use similar mental structures. Taken together, the present work provides unique insights into the conscious experience of time highlights the pragmatic utility of future thought.


2019 ◽  
Vol 5 (4) ◽  
pp. eaav5698 ◽  
Author(s):  
Ty Y. Tang ◽  
Michael K. McBeath

Temporal order judgments can require integration of self-generated action events and external sensory information. We examined whether conscious experience is biased to perceive one’s own action events to occur before simultaneous external events, such as deciding whether you or your opponent last touched a basketball heading out of bounds. Participants made temporal order judgments comparing their own touch to another participant’s touch, a mechanical touch, or an auditory click. In all three manipulations, we find a robust bias to perceive self-generated action events to occur about 50 ms before external sensory events. We denote this bias to perceive self-actions earlier as the “egocentric temporal order” bias. Thus, if two players hit a ball nearly simultaneously, then both will likely have different subjective experiences of who touched last, leading to arguments.


2012 ◽  
Vol 11 (1) ◽  
pp. 1-25 ◽  
Author(s):  
DAVID LABORDE ◽  
WILL MARTIN ◽  
DOMINIQUE VAN DER MENSBRUGGHE

AbstractThis paper uses detailed data on bound and applied tariffs to assess the consequences of the WTO's December 2008 Modalities for tariffs levied and faced by developing countries, and the welfare implications of these reforms. We find that the tiered formula for agriculture would halve tariffs in industrial countries and lower them more modestly in developing countries. In non-agricultural market access (NAMA), the formulas would reduce the tariff peaks facing developing countries and cut average industrial country tariffs by more than a third. We use a political-economy framework to assess the implications of flexibilities for the size of the tariff cuts and find they are likely to substantially reduce the outcome. However, despite the flexibilities, there are likely to be worthwhile gains, with applied tariffs facing developing countries cut by about 20% in agriculture and 28% in NAMA, and sizeable cuts in tariffs facing industrial countries. The welfare impacts of reform are evaluated using a new approach to aggregation that improves on the traditional, flawed approach of weighted-average tariffs. This substantially increases the estimated benefits of an agreement along the lines of these modalities, with estimated global income gains of up to $160 billion per year from market access reform.


2019 ◽  
Author(s):  
Jussi Jylkkä ◽  
Henry Railo

AbstractWhy any type of neural activation is associated with subjective, conscious experience is a fundamental unsolved question in neuroscience. To bridge the gap between neural activity and conscious experience, one seemingly must tie together two very different entities. The paradigmatic view in consciousness science is that subjective experiences are private and cannot be scientifically observed or described: science can only discover correlations between subjective experiences and their neural realizers, but never observe or describe the experiences themselves. We present a metatheory of consciousness that explains how subjective experiences are related to empirical observations and models, and why the two appear so different from each other. We argue that consciousness is a concrete physical process that causally interacts with other physical phenomena. This entails that consciousness can be empirically observed and characterized. The reason why subjective experiences and empirical observations and models of them appear so different is explained by what we call the observer-observed distinction. Empirical observations are always distinct from the observer, but a subject and her experiences constitute a single physical-biological system. We argue that once science has completely described 1) the constitutive neural mechanisms that are isomorphic with experiences, 2) the etiological mechanisms that experiences are based on, and 3) their causal power, then science has provided an exhaustive description of phenomenology. Our conclusion is that, if we accept this framework we call Naturalistic Monism, consciousness collapses into a standard problem of science.


2002 ◽  
Vol 29 (4) ◽  
pp. 295-297 ◽  
Author(s):  
Vincent A. Punzo ◽  
Emily Miller

The Experience Sampling Method (ESM; Larson & Csikszentmihalyi, 1983) is a means to investigate the subjective experiences of individuals as they go about their daily lives. Students from 2 Adolescent Psychology courses used the ESM in a required “beeper project.” Student research teams investigated a typical week in the life of an adolescent by paging research participants at random times and asking them to complete an experience sampling form each time. Students analyzed the data and wrote a paper on a week in the life of an adolescent. Evaluations of the project demonstrate that students found it to be an enjoyable, useful, interesting, and helpful course project.


2020 ◽  
Author(s):  
Sucharit Katyal

Background: Neurobiological changes accompanying meditation training are well-characterised. However, little is known about the neural and physiological basis of altered consciousness induced through meditation, despite such alteration being considered essential for the positive effects of meditation on mental health. The meditation depth questionnaire (MEDEQ) measures alteration of consciousness in five progressive levels of experiential “depth”: hindrances, relaxation, concentration, transpersonal qualities and nonduality. Methods: Using the MEDEQ, we investigated the brain (EEG) and bodily (pulse and respiration) correlates of meditation depth in two groups: long-term meditators (LTM) and meditation-naïve controls (CTL). Results: CTLs reported experiencing more hindrances than LTMs. Whereas, LTMs reported more transpersonal qualities and nonduality during practice compared to baseline. In both groups, theta (4–6 Hz) oscillations correlated positively with hindrances, and increasingly negatively with progressively deeper experiences. Alpha (7–13 Hz) amplitude followed the exact opposite pattern. Experiential deepening was accompanied by theta deactivation over different regions in the two groups—frontal-midline in LTMs and frontal-lateral in CTLs—which correspond to two different aspects of executive processing, monitoring and regulation respectively. Experiential deepening was also associated with reduced heart-rate in CTLs but not LTMs. Conclusions: Alpha and theta oscillations have long been reliably associated with meditation. Our study reveals how they relate to different subjective experiences accompanying such practices. We moreover find that—while critical for overcoming hindrances—executive neural processing is downregulated during deep meditation experiences, and that prolonged training enables downregulation of an earlier stage of executive processing. Finally, prolonged meditation training may help reduce interoceptive influences on conscious experience.


2017 ◽  
pp. 34-60
Author(s):  
Anu Kannike ◽  
Ester Bardone

Kitchen space and kitchen equipment as interpreted by Estonian museums Recent exhibitions focusing on kitchen spaces – “Köök” (Kitchen) at the Hiiumaa Museum (September 2015 to September 2016), “Köök. Muutuv ruum, disain ja tarbekunst Eestis” (The Kitchen. Changing space, design and applied art in Estonia) at the Estonian Museum of Applied Art and Design (February to May 2016) and “Süüa me teeme” (We Make Food) at the Estonian National Museum (opened in October 2016) – are noteworthy signs of food culture-related themes rearing their head on our museum landscape. Besides these exhibitions, in May 2015, the Seto farm and Peipsi Old Believer’s House opened as new attractions at the Open Air Museum, displaying kitchens from south-eastern and eastern Estonia. Compared to living rooms, kitchens and kitchen activities have not been documented very much at museums and the amount of extant pictures and drawings is also modest. Historical kitchen milieus have for the most part vanished without a trace. Estonian museums’ archives also contain few photos of kitchens or people working in kitchens, or of everyday foods, as they were not considered worthy of research or documentation. The article examines comparatively how the museums were able to overcome these challenges and offer new approaches to kitchens and kitchen culture. The analysis focuses on aspects related to material culture and museum studies: how the material nature of kitchens and kitchen activities were presented and how objects were interpreted and displayed. The research is based on museum visits, interviews with curators and information about exhibitions in museum publications and in the media. The new directions in material culture and museum studies have changed our understanding of museum artefacts, highlighting ways of connecting with them directly – physically and emotionally. Items are conceptualized not only as bearers of meaning or interpretation but also as experiential objects. Kitchens are analysed more and more as a space where domestic practices shape complicated kitchen ecologies that become interlaced with sets of things, perceptions and skills – a kind of integrative field. At the Estonian museums’ exhibitions, kitchens were interpreted as lived and living spaces, in which objects, ideas and practices intermingle. The development of the historical environment was clearly delineated but it was not chronological reconstructions that claimed the most prominent role; rather, the dynamics of kitchen spaces were shown through the changes in the objects and practices. All of the exhibits brought out the social life of the items, albeit from a different aspect. While the Museum of Applied Art and Design and the Estonian Open Air Museum focused more on the general and typical aspects, the Hiiumaa Museum and the National Museum focused on biographical perspective – individual choices and subjective experiences. The sensory aspects of materiality were more prominent in these exhibitions and expositions than in previous exhibitions that focused on material culture of Estonian museums, as they used different activities to engage with visitors. At the Open Air Museum, they become living places through food preparation events or other living history techniques. The Hiiumaa Museum emphasized the kitchen-related practices through personal stories of “mistresses of the house” as well as the changes over time in the form of objects with similar functions. At the Museum of Applied Art and Design, design practices or ideal practices were front and centre, even as the meanings associated with the objects tended to remain concealed. The National Museum enabled visitors to look into professional and home kitchens, see food being prepared and purchased through videos and photos and intermediated the past’s everyday actions, by showing biographical objects and stories. The kitchen as an exhibition topic allowed the museums to experiment new ways of interpreting and presenting this domestic space. The Hiiumaa Museum offered the most integral experience in this regard, where the visitor could enter kitchens connected to one another, touch and sense their materiality in a direct and intimate manner. The Open Air Museum’s kitchens with a human face along with the women busy at work there foster a home-like impression. The Applied Art and Design Museum and the National Museum used the language of art and audiovisual materials to convey culinary ideals and realities; the National Museum did more to get visitors to participate in critical thinking and contextualization of exhibits. Topics such as the extent to which dialogue, polyphony and gender themes were used to represent material culture in the museum context came to the fore more clearly than in the past. Although every exhibition had its own profile, together they produced a cumulative effect, stressing, through domestic materiality, the uniqueness of history of Estonian kitchens on one hand, and on the other hand, the dilemmas of modernday consumer culture. All of the kitchen exhibitions were successful among the visitors, but problems also emerged in connection with the collection and display of material culture in museums. The dearth of depositories, disproportionate representation of items in collections and gaps in background information point to the need to organize collection and acquisition efforts and exhibition strategies in a more carefully thought out manner and in closer cooperation between museums.


Zootaxa ◽  
2019 ◽  
Vol 4679 (3) ◽  
pp. 577-595
Author(s):  
JAMES MALLET

Andrew Brower recently published a long article in this journal that seeks to dismantle evidence for hybridization between species of Heliconius butterflies. The main evidence that Brower criticizes here is given in two papers published by my colleagues and myself in 2007. In this reply, I briefly defend our evidence, and at greater length provide additional background information to help establish the credibility of the evidence even more firmly than previously. 


Author(s):  
George D. Pappas ◽  
Jacqueline Sagen

We have been interested in the use of neural transplants mainly as a local source of neuroactive substances, rather than as a replacement for damaged neural circuities. In particular, we have been exploring the possibilities of reducing pain by transplants of opioid peptide producing cells, and reducing depression by transplants of monoamine-producing cells. For the past several years, work in our laboratory has demonstrated in both acute and chronic pain models that transplantation of adrenal medullary tissue or isolated chromaffin cells into CNS pain modulatory regions can reduce pain sensitivity in rodents. Chromaffin cells were chosen as donor source since they produce high levels of both opioid peptides and catecholamines, substances which independently, and probably synergistically, reduce pain sensitivity when injected locally into the spinal cord. The analgesia produced by these transplants most likely results from the release of both opioid peptides and catecholamines, since it can be blocked or attenuated by opiate or adrenergic antagonists, respectively. Furthermore, CSF levels of met-enkephalin and catecholamines are increased by the transplants.


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