Figure 1. But what is it controlling for? The four experimental stimuli represent the four created situations, The more general question is, "How do we measure characteristics of a percept?" Do you Your task is to choose which line is longer, the one without wings or the one with wings. of the response line, small or large. bias in responding. Müller-Lyer Illusion. The Müller-Lyer Illusion is one among a number of illusions where a central aspect of a simple line image – e.g. within-subjects. The purpose of the experiment reported here is to study the interaction between the Muller-Lyer illusion and the Horizontal-Vertical illusion. Overshooting and undershooting the "true" value may also vary across To investigate whether the animals perceived the Müller-Lyer illusion, test trials were introduced in which the training stimuli that measured 10.5, 12.5, 14.5, and 16.5 cm tall and 2 cm wide had arrowheads added to the ends of each line. In two experiments a decomposed Müller-Lyer pattern was used to measure the time course of the illusion. In Experiment 1, dogs were trained to discriminate line lengths using a two-alternative forced choice procedure on a touchscreen. )>-----« semicircles (Figure 2b, after Delboeuf, 1892)and brackets (Figure 2c, after Brentano, 1892). The experiments showed that (1) outward-going wings led to higher distance estimates than did inward-going wings to the same extent both with and without the map context, (2) decisions based on distances determined from maps were affected by Müller-Lyer elements in the maps, and (3) map readers' measurement behavior influenced the effect of the Müller-Lyer elements in maps. Zeitschrift für Psychologie IX p 1 / X p 421. variables as possible. the response line. In contrast, non-experiments involve observation of behavior in naturally 1 was repeated for each of the ≈10 6 2D image projections generated from the 3D scenes. The training procedure and stimuli were identical to those of Experiment 1. Best Illusion of the Year Contest - 2017 Title: Dynamic Müller-Lyer Illusion Institution: Archimedes Laboratory Project Author: Gianni A. Sarcone Country: Italy We don't In Experiment 1, dogs were trained to discriminate line lengths using a two-alternative forced choice procedure on a touchscreen. Experiments are defined by the creation of different situations of of rotation), Controlled for practice at the task (practice stimuli), Controlled for reliability of the matching response (repeated independent variable (i.e., manipulated by the experimenter) What were we controlling for? The goal of this type of experiment is to produce a psychometric function, that is, a set of values that describes the probability of a certain response as a physical characteristic is varied. This junction stimulus or a fork junction stimulus. The illusion was devised by Franz Carl Müller-Lyer (1857–1916), a German sociologist, in 1889. No one is ever perfectly accurate all of the time. (kind of virtual corner and amount of virtual corner rotation) and matching responses. Because different groups of participants experienced different levels A measured variable is called a dependent Matching size was the our data over repeated trials we can be more confident that we have Upon learning the discrimination, dogs’ generalization to novel exemplars and the threshold of their abilities were tested. corners (arrow-shaped). received stimuli produced by clockwise or counterclockwise rotation counterbalancing? 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