2,698 research outputs found

    Change blindness: eradication of gestalt strategies

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    Arrays of eight, texture-defined rectangles were used as stimuli in a one-shot change blindness (CB) task where there was a 50% chance that one rectangle would change orientation between two successive presentations separated by an interval. CB was eliminated by cueing the target rectangle in the first stimulus, reduced by cueing in the interval and unaffected by cueing in the second presentation. This supports the idea that a representation was formed that persisted through the interval before being 'overwritten' by the second presentation (Landman et al, 2003 Vision Research 43149–164]. Another possibility is that participants used some kind of grouping or Gestalt strategy. To test this we changed the spatial position of the rectangles in the second presentation by shifting them along imaginary spokes (by ±1 degree) emanating from the central fixation point. There was no significant difference seen in performance between this and the standard task [F(1,4)=2.565, p=0.185]. This may suggest two things: (i) Gestalt grouping is not used as a strategy in these tasks, and (ii) it gives further weight to the argument that objects may be stored and retrieved from a pre-attentional store during this task

    Studi Konsumsi Baterai Pada Penggunaan Filter Sinar Biru Tablet Komputer Untuk Aktivitas Daring

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    Pengguna perangkat seluler di Indonesia semakin meningkat dari tahun ke tahun. Pada tahun 2022, tercatat lebih dari 370 juta pengguna seluler, melebihi total populasi negara. Penggunaan gawai yang semakin intens dapat meningkatkan risiko gangguan kesehatan, khususnya terhadap organ penglihatan. Salah satu potensi bahaya dari perangkat seluler portabel yang dapat menyebabkan risiko kesehatan mata adalah paparan radiasi sinar biru dari layar gawai. Filter sinar biru, yang sudah disematkan oleh pabrikan gawai pada produk seluler terkini, dapat menjadi salah satu solusi yang bisa dimanfaatkan oleh pengguna untuk meminimalkan risiko tersebut. Namun, masih banyak pemilik perangkat yang belum menyadari keberadaan fitur ini. Selain itu, penggunaan sejumlah fitur pada gawai diprediksi akan meningkatkan konsumsi daya baterai. Artikel ini akan menyajikan hasil survei pengguna terkait pengetahuan mereka tentang fitur filter sinar biru. Lebih lanjut, pengukuran konsumsi baterai menggunakan aplikasi Accubattery juga dilakukan terhadap penggunaan filter sinar biru untuk beberapa aktivitas daring. Hasil survei menunjukkan bahwa lebih banyak pengguna yang belum mengetahui tentang filter sinar biru pada gawai yang mereka miliki. Hasil pengukuran daya baterai menunjukkan bahwa penggunaan filter dapat meningkatkan konsumsi baterai perangkat dengan peningkatan terbesar didapatkan untuk aktivitas menonton video secara daring, yaitu hampir dua kali lipat. Berdasar hasil perhitungan selisih konsumsi daya ketika filter diaktifkan dan tidak, pengguna direkomendasikan untuk mengaktifkan filter saat aktivitas rapat daring dan belajar daring, karena konsumsi daya dari kedua kegiatan tersebut tidak mengalami kenaikan yang signifikan

    Modern lithographic techniques applied to stereographic imaging

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    The main aim of the research has been to produce and evaluate a high-quality diffusion screen to display projected film and television images. The screens have also been found to effectively de-pixelate LCD arrays viewed at a magnification of approximately 4x. The production process relies on the formation of localized refractive index gradients in a photopolymer. The photopolymer, specially formulated and supplied by Du Pont, is exposed to actinic light through a precision contact mask to initiate polymerization within the exposed areas. As polymerization proceeds, a monomer concentration gradient exists between the exposed and unexposed regions allowing the monomer molecules to diffuse. Since the longer polymer chains do not diffuse as readily, the molecular concentration of the material, which is related to its refractive index, is then no longer uniform. The generation of this refractive index profile can, to some extent, be controlled by careful exposure of the photopolymer through the correct mask so that the resulting diffusion screen can be tailored to suit specific viewing requirements. [Continues.

    How much spatial information is lost in the sensory substitution process? Comparing visual, tactile, and auditory approaches

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    Sensory substitution devices (SSDs) can convey visuospatial information through spatialised auditory or tactile stimulation using wearable technology. However, the level of information loss associated with this transformation is unknown. In this study novice users discriminated the location of two objects at 1.2m using devices that transformed a 16x 8 depth map into spatially distributed patterns of light, sound, or touch on the abdomen. Results showed that through active sensing, participants could discriminate the vertical position of objects to a visual angle of 1°, 14°, and 21°, and their distance to 2cm, 8cm, and 29cm using these visual, auditory, and haptic SSDs respectively. Visual SSDs significantly outperformed auditory and tactile SSDs on vertical localisation, whereas for depth perception, all devices significantly differed from one another (visual > auditory > haptic). Our findings highlight the high level of acuity possible for SSDs even with low spatial resolutions (e.g. 16 8) and quantify the level of information loss attributable to this transformation for the SSD user. Finally, we discuss ways of closing this ‘modality gap’ found in SSDs and conclude that this process is best benchmarked against performance with SSDs that return to their primary modality (e.g. visuospatial into visual)

    Impressions from virtual landscapes

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    The aim of this project was to build and render digital landscape models that reflect natural element characteristics and use the resulting data sets as source material for fine art investigation and production. The project utilized 3D computer modeling techniques, selected output technology and studio facilities. Computer-generated virtual landscapes material was incorporated into studio practice by providing observed environmental content for the development of works for exhibition. An accompanying exegesis explored the relationship and tensions between digital landscape data sets and the broader use of landscape as a motif within an Australian context

    On War Photography

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    Ph.D. Thesis. University of Hawaiʻi at Mānoa 2018

    Human-centered display design : balancing technology & perception

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    Tinkering with the Unbearable Lightness of Being: Meditation, Mind-Body Medicine and Placebo in the Quantum Biology Age

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    There are empirical indications that mind-body therapies have a nonlocal quantum component, in addition to the psychoneuroimmunological pathways that have been the focus of the predominant experimental paradigm.  The discussion below addresses the evidence and proposed theoretical mechanisms supporting this conclusion, and makes the case that there should be a convergence of research agendas between mind-body interventions (including placebo),  photomedicine and quantum biology.  Specifically, the role of endogenously generated biophotons in the regulation of genetic expression and the apparent ability of mental intent to direct biophoton emissions to specifically targeted tissues needs to be further evaluated from the perspective of photobiomodulation mechanisms, with a special focus on the spectroscopy and dosimetry of these emissions. Finally, the possible role of long-term meditation in enhancing quantum biological effects has to be further investigated at the level of cellular and macromolecular remodeling, both in the brain and the body
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