![]() ![]() Comparing the similarity relations among percept categories to those among frequency profiles, we observe that though percepts are preferentially induced by particular frequencies, the frequency does not unambiguously determine the experienced percept.Ĭopyright © 2010 Elsevier Inc. The phenomenon in which path of the light incident on the particle is redirected in a different direction this is called scattering of light. We observe a stronger frequency specificity for complex percept classes than elementary percept features. The effect is created by the reflection of light from tiny ice crystals that are suspended in the atmosphere or that comprise high-altitude clouds (e.g. To generalize across subjects, we apply two rating systems, (1) a set of complex percept classes derived from subjects' reports and (2) an enumeration of elementary percept features, and determine distributions of occurrences over flicker frequency. A light pillar is an atmospheric optical phenomenon in which a vertical beam of light appears to extend above and/or below a light source. On the single-subject level, we find a high degree of frequency stability of percepts. We investigate this question using Ganzfeld stimulation and an experimental paradigm combining a continuous frequency scan (1-50 Hz) with a focus on re-occurring, whole percepts. ![]() ![]() We expected to measure increases in student understanding of light phenomena after learning about the wave and particle nature of light in Rwandan secondary schools. Despite a long history of the phenomenon, little is known about the dependence of flicker-induced subjective impressions on the flicker frequency. We designed the light phenomena conceptual assessment (LPCA) to help teachers measure their students conceptual understanding of light phenomena. Flickering light induces visual hallucinations in human observers. ![]()
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