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Related Experiment Video

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

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Determinants of range effects in face recognition.

Eric L Verbeek¹, Marcia L Spetch, Ken Cheng

¹Department of Psychology, University of Alberta, Edmonton, AB T6G 2E9, Canada. everbeek@ualberta.ca

Learning & Behavior

|November 9, 2006

Summary

Stimulus range significantly impacts generalization gradients in human perception, especially for brightness and orientation discriminations. Difficulty in training stimuli can amplify these range effects in morphed face perception.

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Area of Science:

* Cognitive psychology
* Visual perception
* Human behavior

Background:

* Generalization gradients illustrate how learned responses extend to novel stimuli.
* Adaptation level theory predicts how the range of stimuli influences perception.
* Previous research has explored stimulus range effects in various perceptual domains.

Purpose of the Study:

* To investigate the influence of test stimulus range on generalization gradients in humans.
* To examine how different stimulus dimensions (brightness, orientation, morphed faces) affect range effects.
* To explore the role of discrimination difficulty in modulating range effects.

Main Methods:

* Participants performed visual discriminations between faces varying in brightness, orientation, or morphing.
* Experiment 1 assessed range effects across different stimulus types.
* Experiments 2 and 3 manipulated discrimination difficulty and stimulus factors for morphed faces.

Main Results:

* Significant range effects were observed for brightness and orientation variations, aligning with adaptation level theory.
* Range effects were not initially found for morphed faces but emerged when discrimination difficulty was increased.
* Biased testing ranges and difficult training discriminations amplified shifts in response distributions (generalization gradients).

Conclusions:

* Test stimulus range is a critical factor influencing generalization gradients in human visual perception.
* The presence and magnitude of range effects depend on stimulus characteristics and task difficulty.
* Findings support adaptation level theory and highlight the impact of stimulus context on perceptual judgments.