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Related Experiment Video

Updated: May 6, 2026

Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment

Lexical Decision Task for Studying Written Word Recognition in Adults with and without Dementia or Mild Cognitive Impairment

Published on: June 25, 2019

Letters are functional in word identification.

D W Massaro¹, D Klitzke

¹Department of Psychology, University of Wisconsin, 53706, Madison, Wisconsin.

Memory & Cognition

|November 9, 2013

Summary

This summary is machine-generated.

This study investigated word identification, finding that processing single letters is faster than processing whole words. These results support the mediated model of word recognition, not the single-unit pattern hypothesis.

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Area of Science:

Cognitive Psychology
Psycholinguistics
Visual Perception

Background:

Debate exists on whether word identification relies on single-unit patterns or mediated letter processing.
Previous accuracy studies favored the mediated model, while reaction time studies suggested the single-unit pattern hypothesis.

Purpose of the Study:

To investigate the mechanisms of word identification.
To determine if letter processing or single-unit patterns are primary in recognizing words.
To re-evaluate reaction time data in light of factors like parallel processing and stimulus similarity.

Main Methods:

An experiment manipulating stimulus similarity to attenuate parallel letter processing advantages.
Reaction time measurements for single-letter and word identification tasks.
Analysis of results within the framework of the mediated model.

Main Results:

Reaction times indicated a processing advantage for single letters over whole words.
The observed processing advantage for single letters was influenced by manipulating stimulus similarity.
Previous reaction time findings favoring the single-unit pattern hypothesis could be reinterpreted.

Conclusions:

The mediated model of word recognition effectively explains both accuracy and reaction time data.
Letter processing appears to be a crucial mediating step in word identification.
The findings reconcile conflicting results from previous accuracy and reaction time experiments.