The Ebbinghaus illusion in the gray bamboo shark ( Chiloscyllium griseum ) in comparison to the teleost damselfish ( Chromis chromis )

Zoology ◽  
2017 ◽  
Vol 123 ◽  
pp. 16-29 ◽  
Author(s):  
Theodora Fuss ◽  
Vera Schluessel
Keyword(s):  
Ebbinghaus Illusion ◽  
Bamboo Shark ◽  
Chiloscyllium Griseum

scholarly journals Counting on Numbers—Numerical Abilities in Grey Bamboo Sharks and Ocellate River Stingrays

Animals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2634
Author(s):  
Nils Kreuter ◽  
Nele Christofzik ◽  
Carolin Niederbremer ◽  
Janik Bollé ◽  
Vera Schluessel
Keyword(s):  
Cognitive Abilities ◽  
Continuous Variables ◽  
Quantity Discrimination ◽  
Numerical Information ◽  
Invertebrate Species ◽  
Elasmobranch Species ◽  
Bamboo Shark ◽  
High Degree ◽  
Low Rate ◽  
Chiloscyllium Griseum

Over the last decade, studies examining the cognitive abilities of fish have increased, using a broad range of approaches. One of the foci has been to test the ability of fish to discriminate quantities of items and to determine whether fish can solve tasks solely on the basis of numerical information. This study is the first to investigate this ability in two elasmobranch species. All animals were trained in two-alternative forced-choice visual experiments and then examined in transfer tests, to determine if previously gained knowledge could be applied to new tasks. Results show that the grey bamboo shark (Chiloscyllium griseum) and the ocellate river stingray (Potamotrygon motoro) can discriminate quantities based on numerical information alone, while continuous variables were controlled for. Furthermore, the data indicates that similar magnitudes and limits for quantity discrimination exist as in other animals. However, the high degree of intraspecific variation that was observed as well as the low rate of animals proving to be successful suggest that the ability to discriminate quantities may not be as important to these species as to some other vertebrate and invertebrate species tested so far.

Visual discrimination abilities in the gray bamboo shark (Chiloscyllium griseum)

Zoology ◽  
2014 ◽  
Vol 117 (2) ◽  
pp. 104-111 ◽  
Author(s):  
Theodora Fuss ◽  
Horst Bleckmann ◽  
Vera Schluessel
Keyword(s):  
Visual Discrimination ◽  
Bamboo Shark ◽  
Chiloscyllium Griseum

Perception of the Ebbinghaus illusion in 5- to 8-month-old infants

2010 ◽  
Vol 52 (1) ◽  
pp. 33-40 ◽  
Author(s):  
YUKA YAMAZAKI ◽  
YUMIKO OTSUKA ◽  
SO KANAZAWA ◽  
MASAMI K. YAMAGUCHI
Keyword(s):  
Ebbinghaus Illusion

Figural and Semantic Factors in Change in the Ebbinghaus Illusion across Four Age Groups of Children

1996 ◽  
Vol 82 (1) ◽  
pp. 15-18 ◽  
Author(s):  
Lucia Zanuttini
Keyword(s):  
Age Groups ◽  
Older Children ◽  
Ebbinghaus Illusion ◽  
Taxonomic Organization

Changes in the Ebbinghaus illusion across age groups have been studied with 80 children ( ns = 20) from 4 to 8 yr. old. The distortion, whose magnitude increases across age groups, depends on active cognitive comparative processes. In fact, if some cues make the geometrically identical inducing elements semantically different from the central one, the illusion decreases as older children develop conceptual categories. Across ages 4 to 8 years not only the magnitude of the illusion changes but also the interfering role of the taxonomic organization.

Sign in / Sign up

Export Citation Format

Share Document