Metacontrast: Internal contours and different dependent variables View Full Text


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Article Info

DATE

1977-06

AUTHORS

Lester A. Lefton, Linda L. Hernandez

ABSTRACT

Extent of metacontrast was assessed using square-wave black and white gratings as targets. The number of internal contours in the target and delay of the mask were systematically manipulated. Three experiments each used a different dependent variable; Experiment 1 used accuracy, Experiment 2 used duration threshold, and Experiment 3 used category estimations. Results showed, (1) targets with many internal contours are difficult to see, (2) there were no backward enhancement effects, (3) targets with few contours and targets with many contours, when detected, are relatively easy to mask, (4) targets with intermediate numbers of contours (2.54 to 8 cycles/deg) are relatively easy to see and produce monotonic metacontrast functions, but, (5) category estimation measures showed some evidence of U-shaped metacontrast functions. The results are discussed in terms of task differences. More... »

PAGES

427-430

References to SciGraph publications

  • 1973-06. Backward and forward masking in the perception of cutaneous stimuli in ATTENTION, PERCEPTION, & PSYCHOPHYSICS
  • 1974-06. Backward masking of gratings varying in spatial frequency in PSYCHONOMIC BULLETIN & REVIEW
  • 1971-02. Backward masking of visual targets with internal contours: A replication in PSYCHONOMIC SCIENCE
  • 1972-03. Predictive validity of a Rashevsky-Landahl neural net: Test of a model of masking for form in ATTENTION, PERCEPTION, & PSYCHOPHYSICS
  • 1970-07. Safari to masking land: A hunt for the elusive U in ATTENTION, PERCEPTION, & PSYCHOPHYSICS
  • 1973-10. Spatial factors in metacontrast in ATTENTION, PERCEPTION, & PSYCHOPHYSICS
  • 1973-01. Backward masking and enhancement of multisegmented visual targets in PSYCHONOMIC BULLETIN & REVIEW
  • 1970-10. Backward masking of visual targets with internal contours in PSYCHONOMIC SCIENCE
  • 1976-01. Metacontrast with internal contours: More evidence for monotonic functions in PSYCHONOMIC BULLETIN & REVIEW
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    http://dx.doi.org/10.3758/bf03337045

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