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Colored neon flanks and line gap enhancement
Vision Research
|January 1, 1984
Summary
Colored neon flanks appear when a colored line bridges a gap between black lines, extending across significant visual space. This visual illusion, termed "line gap enhancement," is similar to neon color spreading and has parallels in brightness perception.
Area of Science:
- Visual perception
- Neuroscience
- Psychophysics
Background:
- Colored lines connecting lines across a gap produce visible colored neon flanks.
- These flanks are not explained by Bezold-type assimilation.
- Similar phenomena exist in brightness perception.
Purpose of the Study:
- To investigate the phenomenon of colored neon flanks.
- To explore the relationship between neon flanks and neon color spreading.
- To introduce and define "line gap enhancement" and discuss its neural basis.
Main Methods:
- Visual psychophysical experiments were conducted to observe neon flanks.
- Parameters such as gap size, line length, and junction alignment were varied.
- Comparisons were made with existing visual illusions and neuronal properties.
Main Results:
- Neon flanks extend over gap sizes of 50 min arc foveally.
- Effect is elicited by short adjoining black lines (6 min arc).
- Linear continuity maximizes flanks; angular tilt over 40 degrees destroys it.
Conclusions:
- Neon flanks and neon color spreading share similarities, suggesting a common underlying mechanism.
- "Line gap enhancement" describes perceptual enhancement of brightness/color changes along lines.
- Psychophysical properties correlate with end-zone inhibited cortical cell neuronal responses.