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Related Experiment Videos

How accurate is size and distance perception for very far terrestrial objects? Function and causality

A Higashiyama1, K Shimono

  • 1University of Osaka Prefecture, Sakai, Japan.

Perception & Psychophysics
|April 1, 1994
PubMed
Summary

Object size and distance perception were studied across various ranges. Results indicate direct perception models are valid, while accounting for perceived distance is not supported by the data.

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Area of Science:

  • Visual perception
  • Psychophysics
  • Cognitive psychology

Background:

  • Understanding how humans perceive object size and distance is crucial for navigation and interaction.
  • Previous models proposed either direct perception or an 'accounting' mechanism where apparent size is adjusted by perceived distance.

Purpose of the Study:

  • To investigate the accuracy of absolute size and distance estimation for objects at different viewing distances.
  • To differentiate between direct perception models and 'taking-into-account' models of visual perception.

Main Methods:

  • Experiments were conducted at near (0.4-5.0 m) and far (1.1-15.3 km) viewing distances.
  • Participants estimated the objective size (S) and distance (D) of natural and artificial objects.
  • Statistical analyses, including partial correlations, were used to examine relationships between estimated (S', D') and objective (S, D) values, and visual angle (theta).

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Main Results:

  • Size and distance estimates (S', D') correlated with objective size and distance (S, D) via a power function with an exponent of unity.
  • Individual differences in the exponent were noted for far objects.
  • The ratio of apparent size to apparent distance (S'/D') was better described by models incorporating visual angle (theta) than by simple tangent functions.
  • High correlations were found between S and S', and D and D', but a low correlation between D' and S' for far objects.
  • Both D' and S' were highly correlated with S, D, and theta, with a strong positive correlation between D' and S' in Experiment 2.

Conclusions:

  • The direct-perception model, where size and distance are perceived directly from stimuli, is supported in certain situations.
  • The 'taking-into-account' model, suggesting apparent size is modified by apparent distance, is not supported by the experimental data.