ORCID Profile
0000-0002-5029-2975
Current Organisations
CSIRO Black Mountain Laboratories
,
University of Melbourne
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Publisher: Elsevier BV
Date: 11-1995
DOI: 10.1016/0042-6989(95)00075-B
Abstract: Observers scanned a stationary pattern comprising a tilted sine-wave grating completely surrounding another grating of similar spatial frequency but tilted in the opposite direction (Fig. 2). They reported an illusory "sliding" motion of the inset grating with respect to the surround grating and the effect was clearly strongest for angles between the gratings of less than 60 degrees and for spatial frequencies between 6-11 cpd. In a second experiment, a similar pattern was moved (2.0 deg/sec) either up or down for a presentation time of 167 msec. Simultaneously, the inset grating was drifted at different speeds in each of its two directions. Using the method of constant stimuli, it was shown that the relative motion illusion could be cancelled by physically drifting the grating in the opposite direction to the illusory movement. The illusion arises because there is a failure to integrate two motion signals into the single motion vector which characterises rigid motion.
Publisher: Wiley
Date: 04-07-2018
DOI: 10.1111/JSE.12436
Publisher: Magnolia Press
Date: 14-01-2014
DOI: 10.11646/ZOOTAXA.3754.2.8
Abstract: Rich collections of bio ersity data are now synthesized in publically available databases and phylogenetic knowledge now provides a sound understanding of the origin of organisms and their place in the tree of life. However, these knowledge bases are poorly linked, leading to underutilization or worse, an incorrect understanding of bio ersity because there is poor evolutionary context. We address this problem by integrating bio ersity information aggregated from many sources onto phylogenetic trees. PhyloJIVE connects bio ersity and phylogeny knowledge bases by providing an integrated evolutionary view of bio ersity data which in turn can improve bio ersity research and the conservation decision making process. Bio ersity science must assert the centrality of evolution to provide effective data to counteract global change and bio ersity loss.
Publisher: Springer Science and Business Media LLC
Date: 11-2007
DOI: 10.3758/BF03192969
Abstract: Computer analysis of video footage is one option for recording locomotor behavior for a range of neurophysiological and behavioral studies. This technique is reasonably well established and accepted, but its use for some behavioral analyses remains a challenge. For ex le, filming through water can lead to reflection, and filming nocturnal activity can reduce resolution and clarity of filmed images. The aim of this study was to develop a noninvasive method for recording nocturnal activity in aquatic decapods and test the accuracy of analysis by video tracking software. We selected crayfish, Cherax destructor, because they are often active at night, they live underwater, and data on their locomotion is important for answering biological and physiological questions such as how they explore and navigate. We constructed recording arenas and filmed animals in infrared light. Wethen compared human observer data and software-acquired values. In this article, we outline important apparatus and software issues to obtain reliable computer tracking.
Publisher: Oxford University Press (OUP)
Date: 17-01-2014
DOI: 10.1093/BIOINFORMATICS/BTU024
Abstract: Motivation: Rich collections of bio ersity information such as spatial distributions, species descriptions and trait data are now synthesized in publicly available online sources such as GBIF. Also phylogenetic knowledge now provides a sound understanding of the origin of organisms and their place in the tree of life. We demonstrate with PhyloJIVE that any phylogenetic tree can be linked to online bio ersity data in the browser. This evolutionary view of bio ersity data is demonstrated in a case study that suggests that this approach may be useful to scientists and non-experts users. Contact: joe@acaciamulga.net Supplementary information: Supplementary data are available at Bioinformatics online.
Publisher: Oxford University Press (OUP)
Date: 07-05-2013
DOI: 10.1093/ICB/ICT038
Abstract: Contemporary collections of sponges in the Indo-west Pacific have escalated substantially due to pharmaceutical discovery, national bioregional planning, and compliance with international conventions on the seabed and its marine genetic resources beyond national jurisdictions. These partially processed operational taxonomic unit (OTU) collections now vastly outweigh the expertise available to make them better "known" via complete taxonomy, yet for many bioregions they represent the most significant body of currently available knowledge. Increasing numbers of cryptic species, previously undetected morphologically, are now being discovered by molecular and chemical analyses. The uncoordinated and fragmented nature of many previous collections, however, means that knowledge and expertise gained from a particular project are often lost to future projects without a bio ersity informatics legacy. Integrating these erse data (GIS OTUs images molecular, chemical, and other datasets) required a two-way iterative process so far unavailable for sponges with existing bio ersity informatics tools. SpongeMaps arose from the initial need for online collaboration to integrate morphometric data with molecular barcodes, including the Porifera Tree of Life (PorTol) project. It provides interrogation of existing data to better process new collections capacity to create new OTUs publication of online pages for in idual species, so as to interpret GIS and other data for online bio ersity databases and services and automatic links to external datasets for taxonomic hierarchy, specimen GIS and mapping, DNA sequence data, chemical structures, and images.
Publisher: Springer Science and Business Media LLC
Date: 30-05-1997
Abstract: Many interactive human skills are based on real-time error detection and correction. Here we investigate the spectral properties of such skills, focusing on a synchronization task. A simple autoregressive error correction model, based on separate 'motor' and 'cognitive' sources, provides an excellent fit to experimental spectral data. The model can also apply to recurrent processes not based on error correction, allowing commentary on previous claims of 1/f-type noise in human cognition. A comparison of expert and non-expert subjects suggests that performance skill is not only based on reduced variance and bias, but also on the construction of richer mental models of error correction.
Publisher: Springer Science and Business Media LLC
Date: 04-1997
DOI: 10.3758/BF03211911
Abstract: The spatial parameters underlying a novel illusion of relative motion are characterized. A simple stimulus composed of two sine-wave gratings was sufficient to generate the illusion. We measured the response of subjects to rapid, small- litude oscillations of this stimulus behind a fixation point. The effect was clearly strongest for acute angles between the gratings, but only when spatial frequency was between 6 and 11 cpd. We surmise that activity in the grating cells of the primate visual cortex (von der Heydt, Peterhans, & Dursteler, 1992) might be the cause of the illusion. The illusion is potentially an important tool in understanding how higher cortical areas combine disparate motion signals.
No related grants have been discovered for Garry Jolley-Rogers.