Time-to-Collision (TTC) judgements with offsize objects show that Tau needs to be intergrated with familiar size to explain TTC performance

Observers judged TTC with computer-generated displays simulating an approaching object in three familiar-size conditions:

(i) Real-size (smaller, larger objects depicted as tennis, soccer balls respectively).
(ii) Off-size (smaller, larger objects depicted as soccer, tennis balls respectively).
(iii) Ambiguous-size (smaller, larger objects depicted as texture-less black balls of different size).

Displays simulated objects approaching observersí viewpoint from 24.96 m, and disappearing at 5.76 m. Manipulation of approach velocities (4.8-19.2 msec-1) produced viewing times from 1.0 to 4.0 sec, and delays between object disappearance and tau-based TTC ranging from 0.3 to 1.2 sec. Motion characteristics of smaller and larger objects in the three familiar-size conditions simulated those of approaching real-sized tennis and soccer balls respectively; that is, for each approach velocity, tau‚-based TTC was the same across the three conditions for smaller and larger objects.

Results showed that, consistent with the proposition of tau-determined TTC, TTC estimates in the real-size condition were uninfluenced by object size. This is contrary to previous reports that TTC for larger objects is underestimated relative to TTC for smaller objects. However, such size-dependent TTC differences were found in the ambiguous-size condition, with even larger differences in the off-size condition; TTCs for the ëlargerí tennis ball were much less than TTCs to the ësmallerí soccer ball compared to corresponding TTCs in the ambiguous-size condition. These results are problematic for the proposition that tau solely determines TTC. We discuss the role of perceptual learning in resolving this problem.

Health risk behaviours and health care needs among people with psychiatric illness

This paper presents findings from two studies. Study 1 explored differences between people with psychiatric illness (PPI) (N=144) and the general population (N=151) in levels of low-fat diet, exercise and smoking. Study 2 investigated barriers and health care needs of PPI (N=60). The prevalence of overweight, cigarette smoking and sedentary lifestyle were significantly greater among PPI than the general population. Major predictors were limited social support, knowledge of correct dietary principles, lower self-efficacy, psychiatric symptomatology and various psychotropic drugs. The findings demonstrated that PPI over-used medical services but under-used preventive services due to inaccessibility, lower satisfaction and knowledge of services.

Assessment of indigenous older peoples ’ needs for home and community care in remote central Australia

The Home and Community Care (HACC) program in Australia provides services which supports older people to live at home. Individual HACC organisations are generally responsible for initial assessment of eligibility and need of clients presenting for services. This paper reports on a project which aimed to develop an understanding of the various approaches to assessment of client needs in Central Australia. The majority of clients in this geographical area are indigenous. The project was initiated in recognition of the primary importance of assessment in determining service access and service delivery and of the particular challenges faced by service providers in remote areas. This paper discusses key project findings including the client group and services provided, initial needs assessment and care planning processes. Evident inconsistencies in practice reflect a variety of complex contextual factors. Staff in remote areas have an inadequate knowledge base to draw upon to assist them with assessment and care planning decisions, and further research and professional development is required.

Information systems and healthcare XXVIII : the information needs of family carers in collaborative healthcare

While the important role of family carers has been increasingly recognized in healthcare service provision, particularly for patients with acute or chronic illnesses, the family carer's information needs have not been well understood or adequately supported by health information systems. In this study, we explore the information needs of a family carer by analyzing the extensive online diary of a Vietnamese family carer supporting his wife, who was a lung cancer patient. The study provides a deep understanding of the information needs of the family carer and suggests a four-stage information journey model including identification, searching, interpretation and information sharing, and collaboration. A number of themes emerge from the study including the key role of the carer, information filtering by the carer, information sharing and collaboration, and the influence of Vietnamese culture. The paper concludes with a discussion of the requirements for health information systems that meet the needs of family carers.

The effect of active support training on engagement, opportunities for choice, challenging behaviour and support needs

Background: The aim of this study was to evaluate active support (AS) training and to investigate changes to perceived engagement in domestic tasks, opportunities for choice, frequency of challenging behaviour, and level of support needs.

Method: Participants were 12 adults with ID aged 27–57 years (M = 37 years) residing in three group homes, and their support workers. The support workers completed assessments on three occasions (at baseline, post-training, and at follow-up).

Results: Residents' engagement in domestic tasks increased over time, and overall choice increased, although perceived choice in two life domains initially increased, but decreased to baseline levels at follow-up. Residents exhibited an overall decrease in anxiety, self-absorbed behaviour, disruptive behaviour, and problem behaviour in general. There was also an overall decrease in perceived support needs for five activity domains, with no change for one domain.

Conclusions: The results contribute to a growing body of evidence demonstrating favourable outcomes of AS in terms of engagement and challenging behaviour in people with ID. Surprising results are presented for choice and perceived support needs, warranting further investigation.