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Automaticity in fast lexical decision sequential effects: much like telling left from right.

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Sequential effects in lexical decision tasks are driven by general choice processes, not just word-specific ones. Response repetition equally facilitates both word and nonword decisions, suggesting automatic response facilitation plays a key role.

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Area of Science:

  • Cognitive Psychology
  • Psycholinguistics
  • Human Decision-Making

Background:

  • Sequential effects in lexical decision tasks (LDT) traditionally attributed to word-specific processes.
  • Previous explanations focused on discriminating words from nonwords.

Purpose of the Study:

  • To test if generic choice processes, rather than choice-specific ones, explain sequential effects in LDT.
  • To investigate the role of automatic response facilitation in LDT.

Main Methods:

  • An experiment with 82 participants completing LDT with a rapid 100 ms response-stimulus interval.
  • Inclusion of word/nonword discriminability as a factor.
  • Analysis of sequential effects across response times, discriminability levels, and higher-order trials.

Main Results:

  • Sequential effects were identical for words and nonwords, contrary to previous findings.
  • Facilitation by response repetition occurred consistently across response times and discriminability.
  • Second-order repetition facilitation was a strong main effect, comparable to interactive effects.

Conclusions:

  • Generic choice processes, particularly automatic response facilitation, sufficiently explain LDT sequential effects.
  • Choice-specific processes may not be necessary for these observed effects.
  • Lexical decision tasks can serve as a valuable tool for studying general choice mechanisms.