Use of an auditory looming task to test infants' sensitivity to sound pressure level as an auditory distance cue

This study describes how an auditory looming technique was used to investigate 4-to 6-month-old infants' sensitivity to sound pressure level (SPL) as an auditory distance cue. Thirty-two infants were tested in complete darkness and presented with auditory stimuli that underwent unidirectional variations in SPL (40–70dB). The rate at which SPL was varied during the course of trials (past vs. slow) was manipulated by varying trial length (5s vs. 10s).

Dispersion statistics and a sampling plan for Helicoverpa (Lepidoptera : Noctuidae) on fresh-market tomatoes (Lycopersicon esculentum)

Helicoverpa spp. is the primary pest in the Australian fresh-market tomato industry. We describe the spatial distribution of Helicoverpa spp. eggs on fresh-market tomato crops in the Goulburn Valley region of Victoria, and present a sequential sampling plan for monitoring population densities. The distribution of Helicoverpa spp. eggs was highly contagious, as indicated by a Taylor's b-value of 1.59. This high level of contagion meant that relatively large sample sizes would need to be collected to obtain an estimate of population density. High-precision sampling plans generally necessitated impractical sample sizes, and thus the plan we present is a relatively low-precision level plan (SE/mean = 0.3). Nonetheless, this level of precision is considered adequate for most agronomic scenarios. The plan was validated using a statistical re-sampling approach. The level of precision achieved was generally close to the nominal level. Likewise, the number of samples collected generally showed little departure from the theoretically calculated minimum sample size.

Breaking the boundaries : improving the assessibility, extent and responsiveness of support services for distance education students

Massey University, in common with other tertiary distance education providers, faces the challenge of improving the accessibility, extent and responsiveness of the support services it provides to extramural students. In particular, the university is challenged by the need to develop and deliver support services responsive to the changing needs of an increasingly diverse student population. This paper outlines the key findings of a comprehensive review of Massey’s support policy and services for extramural students. It describes how the review findings, and material from the body of literature on the provision of support for distance students, were used to inform the development of a new support policy for extramural students. How this policy is being made operational in practice, through the design, development and implementation of an extensive range of new student support services, including a range of services provided online, is outlined. A summary of progress made so far is provided. The paper concludes with some guidelines that may be useful in informing the practice of colleagues working to break the boundaries to student participation in support services.