Abstract
World in Motion: Perception and Discrimination of Movement in Juvenile Grey Bamboo Sharks (Chiloscyllium griseum)
Highlights
The aim of the present study was to test juvenile grey bamboo sharks (Chiloscyllium griseum) for their ability to perceive and discriminate simple and complex motion patterns
Considering ecology and lifestyle of bamboo sharks, the ability to detect and recognize movement and to correctly identify an organism from a new perspective seems crucial for survival as predators, prey, or con-specifics vary in size, shape and coloring, but move around, sometimes rapidly, often changing their position in space or approach angle
Shark 2 did not participate in the transfer tests
Summary
The aim of the present study was to test juvenile grey bamboo sharks (Chiloscyllium griseum) for their ability to perceive and discriminate simple and complex motion patterns. Following extensive testing of biological motion perception in adult humans, Johansson (1973) defined "biological movement" as a type of visually induced stimulus allowing for the perception, detection and distinction of characteristic movements even when these were abstracted and presented without any figural information. In his pioneering study, the movement of a human body was reduced to a few light spots, marking the position of essential joints on dark clothing – known as Point Light Displays (PLD). Based on PLDs, humans can recognize and distinguish friends and family (Cutting & Kozlowski, 1977), gender (Beardsworth & Buckner, 1981; Cutting & Kozlowski, 1977; Kozlowski & Cutting, 1977), emotions such as fear, anger, grief, joy, disgust or surprise (Dittrich, 1993; Dittrich, Troscianko, Lea, & Morgan, 1996), interactions in couples (Dittrich, 1993) as well as other aspects (reviewed in Nakayama, 1985; Troje, 2008)
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