Muller Lyer Illusion is a visual illusion that involves arrows. When you are done with data collection, you should write up a lab report using the format described in the separate hand-out. The illusion was first created by a German psychologist named Franz Carl Muller-Lyer in 1889. In this task participants are required to judge which line is longer than the other. The Muller-Lyer Experiment presents the participant with two lines. Psychology 0044 Muller-Lyer Page 3 standardITI –- Time in milliseconds before trial, after standard is shown. The illusion is about our wrong judgements on the length of lines. The Muller-Lyer illusion is a well-known optical illusion in which two lines of the same length appear to be of different lengths. Therefore, to extend the investigation of the muller-lyer illusion with this theory, it was aimed to investigate whether the muller-lyer effect due to Gregory’s misapplied size Constance scaling. Explain terminology to describe figure. 1. In particular, we wondered whether it would be possible to find a combination of arrowhead angles and line angles so that the two illusions completely canceled … When presented with the two lines, the participant had to choose whether the plain line was longer or shorter than the line with wings as … Link to “Read About Studies”) So the shape of the virtual corners (concave vs. convex) is an independent variable (i.e., manipulated by the experimenter) and it is within-subjects (i.e., everyone tested gets the same percentage of both concave and convex corners). It has been designed experiment based on these finding comparing three conditions: vertical, diagonal, and horizontal. One line is a just a plain line that varies in size by round and the other is a line with wings that is always 100 pixels long. Lines with arrows pointing outwards are usually considered shorter than those with arrows pointing inwards. (2)The experiment controls the Degree of Rotation of the Corners: Each subject sees … It was devised by Franz Carl Muller-Lyer in 1889. What is it? The figures were placed directly in front of the S, a little above the level of the eyes, at a distance of about 44 cm. The purpose of the experiment reported here is to study the interaction between the Muller-Lyer illusion and the Horizontal-Vertical illusion. A recent report by Catherine Howe and Dale Purves summarizes current thinking on Gregory's ideas: Although Gregory's intuition about the empirical significance of the Müller-Lyer stimulus points in the right general direction (i.e., an explanation based on past experience with the sources of such stimuli), convex and concave … Muller Lyer Illusion. A partial report procedure was used to prevent the subjects from focusing only on parts of the pattern and to maximize visual processing. Studied the Muller-Lyer illusion by photographing 5 Ss while they were inspecting the Muller-Lyer figure. The Müller-Lyer figure was decomposed into two parts, its angles and its line. (Go in as Educator. Perceptual compromise was investigated, by measuring the impact of global and local processing on perceptions of size, as modulated by Navon stimuli. The photographs indicate that successive movements of the eye do not end at exactly the same relative … The present study provides the first direct test of Day’s (1989) Conflicting Cues theory to account for the Muller-Lyer illusion. (APA format rules for Figure.) Introduction – 3 major sections - Muller-Lyer Illusion . Some comments What is the effect? this is the Muller-Lyer Illusion : ... you use the following application as described on the lab-report handout. This experiment is based on illusion devised by Franz Carl Müller-Lyer in 1889. Use OPL site. Muller-Lyer Lab Report Contents . Describe/explain using Figure from Topics page. 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