Letter chunk frequency does not explain morphological masked priming : Affix frequency in masked priming

Area of Science:

• Cognitive Psychology
• Computational Linguistics
• Neuroscience

Background:

• Morphemes, or meaningful letter chunks, play a role in visual word identification.
• Previous research used masked priming to show morpheme sensitivity in complex words and nonwords.

Purpose of the Study:

• Investigate if sensitivity to morphemes in visual word identification stems from the visual system's sensitivity to letter co-occurrence statistics.
• Determine if the frequency or morphological status of word endings influences masked priming effects.

Main Methods:

• Used masked priming with nonword primes combining stems with frequent derivational suffixes, frequent non-morphological endings, and infrequent non-morphological endings.
• Conducted additional tasks to measure nonword interpretability and word-likeness to assess their modulation of priming.
• Replicated findings in a second experiment using lexical primes.

Main Results:

• Masked priming was not affected by the frequency or morphological status of word endings.
• This pattern remained consistent even when using lexical primes.
• Nonword interpretability and word-likeness did not influence the observed priming effects.

Conclusions:

• Early visual processing in word identification is likely based on automatic stem/word extraction.
• Letter chunk frequency does not appear to be a primary factor in the early stages of visual word identification.
• The visual system's sensitivity to letter co-occurrence statistics, not morphological structure, underpins masked priming effects.