Evidence for processing of constituent singleand multiletter codes: Support for multilevel coding in word perception

Area of Science:

• Cognitive Psychology
• Psycholinguistics
• Neuroscience of Language

Background:

• Understanding word processing is crucial for cognitive psychology.
• Current models debate whether word perception relies on single-letter units or larger components like bigrams.
• Investigating constituent activation sheds light on reading mechanisms.

Purpose of the Study:

• To determine if constituent codes (single letters and bigrams) are activated during word processing.
• To test the facilitative effects of word primes on target identification.
• To differentiate between single- and multi-letter unit processing models.

Main Methods:

• A priming procedure was employed in two experiments with skilled readers.
• Participants identified letter and bigram targets presented after a prime word.
• Conditions included targets present or absent in the prime word.

Main Results:

• Single-letter targets were facilitated by primes, showing a facilitative, not inhibitory, effect.
• High- and low-frequency bigram targets showed a processing advantage when present in primes.
• Single letters within low-frequency bigrams benefited from priming, unlike those in high-frequency bigrams.

Conclusions:

• Both single- and multi-letter constituents are demonstrably active during word perception.
• Findings support multicomponent models of word recognition over single-component theories.
• The study provides evidence for the availability of sublexical units in reading.