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Resistance to positional noise scales with target size
1Department of Psychology, School of Behavioural Science, University of Melbourne, Parkville, Victoria, Australia.
Vision Research
|May 1, 1994
Summary
Visual perception of line separation worsens with increased base separation. Resistance to positional noise, however, grows with base separation, challenging existing models of visual processing.
Area of Science:
- Visual perception
- Psychophysics
- Spatial processing
Background:
- Discriminating between two target lines becomes harder as their base separation increases.
- This difficulty may stem from larger base separations being processed by broader neural mechanisms with inherent positional uncertainty.
Purpose of the Study:
- To investigate how separation discrimination changes with varying base separations.
- To assess the impact of positional noise on separation discrimination across different base separations.
Main Methods:
- Separation discrimination was measured as a function of base separation.
- Randomly jittering targets were used to introduce positional noise.
Main Results:
- Resistance to positional noise increased proportionally with the base separation of the targets.
- This finding contradicts models suggesting a decline in noise resistance beyond fixational instability.
Conclusions:
- The visual system's ability to resist positional noise scales with target separation.
- Positional uncertainty may not be the sole factor limiting separation discrimination at larger base separations.