An essential feature of intelligent sensory processing is the ability to focus on the part of the signal of interest against a background of distracting signals, and to be able to direct this focus at will. In this paper the problem of auditory streaming is considered and a model of the early stages of the process is proposed. The behavior of the model is shown to be in agreement with a number of well-known psychophysical results, including the relationship between presentation rate, frequency separation and streaming, the temporal development of streaming, and the effect of background organization on streaming. The principal contribution of this model is that it demonstrates how streaming might result from interactions between the tonotopic patterns of activity of incoming signals and traces of previous activity which feed back and influence the way in which subsequent signals are processed. The significance of these results for auditory scene analysis is considered and a framework for the integration of simultaneous and sequential grouping cues in the perception of auditory objects is proposed.
The UK Government has highlighted the need to develop appropriate information and support services for informal carers. Previous research that has investigated informal caring has found that managing medication is one aspect of the caring role that presents its own problems; however, these have not been subject to detailed examination. The objective of the present paper was to report the number and type of problems experienced by informal carers when managing medication for older care recipients, and to relate these to measures of coping and health. This was a cross-sectional survey undertaken in one district in each of four randomly selected health authority areas in England. Structured interviews, comprising closed and open questions, with 184 informal carers and 93 associated older care recipients were conducted in participants' own homes. Data were gathered on the number and type of medication-related problems experienced in relation to the informal caring role, and the impact of these from carers' perspectives in terms of coping and health. Sixty-seven per cent of carers reported problems with at least one medication-related activity. Problems were associated with all types of medication-related activities, and experienced by carers providing different levels of care for older people. Four themes were identified from carers' accounts which illustrated a diversity of practical problems and anxieties: maintaining continuous supplies of medication in the home; assisting with administration; making clinical judgements; and communicating with care recipients and health professionals. Carers reporting greater numbers of medication-related problems were more likely to experience higher levels of carer strain (P < 0.001) and poorer mental health status (P < 0.001). The findings of the present study provide insights to inform the development of primary care services to support informal carers in the management of medication for older people.
Prescription medicines are increasingly being switched to over-the-counter (OTC, nonprescription) status in the developed world, with the support of government policy. These changes may provide greater choice for individuals and offer potential savings in government spending on health while expanding the market for pharmaceutical companies. However, there is concern regarding the safety of these reclassifications. Elderly people are the largest consumers of prescription and OTC medicines and are more vulnerable to drug adverse effects and the risks of multiple or inappropriate medications. Commonly purchased agents such as NSAIDs have recognised adverse effects which have been shown to be more common in the elderly. Furthermore, all sedatives, including antihistamines, have a propensity to cause falls in older people. As many doctors do not ask patients about OTC medicine use, problems related to use of these drugs may go undetected. Furthermore, the increased availability of OTCs may result in a delay in patients consulting medical practitioners for potentially serious conditions, although this has not so far been investigated. In the UK, the recent switch of a low-dose HMG-CoA reductase inhibitor (statin) to OTC status has caused concern. Although there might theoretically be some benefits from improved access to medications used in primary and secondary prevention of heart disease, the actual outcomes of use of this reduced dose of the statin will be difficult or impossible for patients or practitioners to monitor. OTC drug use implies a mutual responsibility for communication between patients and health professionals that in practice is not always achieved. Epidemiological research is needed to investigate patterns of OTC use and evaluate the potential risks of OTC medicines in elderly people. Governments, regulatory bodies, professionals and the drug industry have a responsibility to ensure that robust systems are in place if the increased use of OTC medicines by elderly people is to be safe and effective.
These patterns of partnership need to be recognized and taken into account by health professionals when providing information, advice and support. They need to listen for indications of differing perspectives and be aware of their possible implications for adherence to medication regimens. In caring for older people, health professionals need to find a balance that respects their autonomy whilst providing support for carers to enable them to be effective in their roles.
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