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Related Experiment Videos

Effect of practice, mapping, stimulus and size on string matching.

S Algarabel1, M J Soler, A Pitarque

  • 1Facultad de Psicologia, Universidad de Valencia, Spain.

Perceptual and Motor Skills
|December 1, 1987
PubMed
Summary
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This study investigated the same-different discrepancy in matching tasks. Faster reaction times for "all same" responses compared to "all different" responses were observed, especially with familiar stimuli.

Area of Science:

  • Cognitive Psychology
  • Human Information Processing

Background:

  • The same-different discrepancy is a known phenomenon in cognitive tasks.
  • Previous studies have established this discrepancy in various matching paradigms.

Purpose of the Study:

  • To investigate the same-different discrepancy in a string matching task.
  • To examine the influence of presentation type, practice, and stimulus type on this discrepancy.

Main Methods:

  • Participants performed a matching task determining common elements in strings (size 1-4).
  • Variables included presentation type (fixed/varied sets), practice (four blocks), and stimulus type (letters/words).
  • Reaction times for positive (all same) and negative (all different) responses were recorded.

Main Results:

Related Experiment Videos

  • Pure positive responses were faster than negative responses, confirming the same-different discrepancy.
  • The discrepancy was reduced with fixed sets (well-learned) and word stimuli.
  • This suggests a shift towards global stimulus characteristics with practice and familiar stimuli.

Conclusions:

  • The same-different discrepancy is robust but can be modulated by learning and stimulus familiarity.
  • Familiar stimuli like words may facilitate a more efficient, holistic comparison process.
  • Cognitive strategies adapt based on stimulus properties and task experience.