2,698 research outputs found
Change blindness: eradication of gestalt strategies
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 43149â164]. 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
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
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
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 âmodality gapâ 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
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
Ph.D. Thesis. University of HawaiÊ»i at MÄnoa 2018
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Is physicalism "really" true?: an empirical argument against the universal construal of physicalism
textPhysicalism as universally construed is the thesis that everything in the world is either physical or a consequence of physical facts. Certain consequences of physicalism for free will, religion, and so on make it unpalatable to some. Physicalism should not be dismissed merely on its unpalatability. Nonetheless, we should be very sure it is true before accepting it uncritically (as much of science and philosophy now do). Physicalism is a contingent thesis, taken as true on the basis of strong inductive evidence and an inference-to-the-best-explanation that specifies it as the best theory over any of its competitors to provide an ontological account of the universe. So long as there is no contrary evidence to the claims of physicalism, then it stands relatively uncontested.
I argue that there is a body of well-attested empirical evidence that falsifies universally-construed physicalism by violating an essential assumption of the theory â causal closure of the physical domain. I present a detailed account of this closure-violating evidence. So that those who are unfamiliar with the body of evidence on offer may judge its validity, I include brief summations of experimental designs, findings, and analyses, plus some controversies pertaining to the data and their resolutions. I then argue why this body of empirical evidence should count against universal physicalism, argue for the evidenceâs scientific legitimacy, and discuss criticisms which have been lodged against it, then explain why these criticisms lack force.
I conclude that the evidence I present is sufficient to falsify the universal construal of physicalism as supported by todayâs and by foreseeable future understandings of the physical world. I acknowledge, though, that nothing can be guaranteed against an indefinite âwait-and-seeâ argument for some implausible âfully-realizedâ physics that may be able to reconcile the evidence I propose with such a fully-completed formulation of physicalism. I suggest that if this is the best physicalists can come up with, then their position is weak and the inference-to-the-best-explanation that until now supported universal physicalism should be turned around to tell against the theory.Philosoph
Tinkering with the Unbearable Lightness of Being: Meditation, Mind-Body Medicine and Placebo in the Quantum Biology Age
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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