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Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues

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Tits use amodal completion in predator recognition: a field experiment.

Katerina Tvardíková¹, Roman Fuchs

¹Department of Zoology, Faculty of Biological Science, University of South Bohemia, Branisovská 31, 370 05 Ceské Budejovice, Czech Republic. katerinatvardikova@seznam.cz

Animal Cognition

|February 5, 2010

Summary

Wild birds demonstrate amodal completion, a cognitive ability allowing them to perceive whole objects from partial views. This study shows untrained tits use this complex function to recognize predators, not just simple cues.

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Area of Science:

Animal cognition
Behavioral ecology
Sensory perception

Background:

Amodal completion allows perception of complete objects from partial views.
Previous research confirmed amodal completion in trained animals using operant conditioning or filial imprinting.
The role of amodal completion in object recognition by untrained animals was unexplored.

Purpose of the Study:

To investigate if untrained birds utilize amodal completion for predator recognition.
To assess the cognitive abilities underlying object recognition in wild bird populations.

Main Methods:

Field experiment using two feeders with varying stimuli.
Presented tits with partly occluded sparrowhawk torsos and complete dummy birds (pigeon or sparrowhawk).
Recorded bird visitation rates to assess predator avoidance and recognition.

Main Results:

Birds avoided both torso variants when a safe 'pigeon' dummy was present.
When a 'sparrowhawk' dummy was present, visits to an amputated torso increased threefold, while visits to an occluded torso remained low.
Birds distinguished between occluded and amputated torsos, indicating complex cognitive processing.

Conclusions:

Untrained tits exhibit amodal completion in recognizing predators.
Object recognition in birds involves complex cognitive functions beyond simple sign stimuli.
Amodal completion plays a role in the natural foraging and survival behaviors of wild birds.