Does CaSe-MiXinG disrupt the access to lexico-semantic information?

Area of Science:

• Cognitive Psychology
• Psycholinguistics
• Visual Word Recognition

Background:

• Mixed-case words (e.g., WoRdS) can impair reading performance.
• The cause of this impairment is debated: impoverished lexical-semantic access or visual familiarity bias.

Purpose of the Study:

• To investigate if the mixed-case effect stems from lexical-semantic access difficulties or visual familiarity.
• To differentiate between genuine effects on meaning retrieval and visual processing biases.

Main Methods:

• Two experiments were conducted using same-case versus mixed-case stimuli.
• Tasks included lexical decision (word/nonword discrimination) and semantic categorization.
• Participant responses (accuracy and speed) were recorded.

Main Results:

• Lexical decision tasks showed faster, more accurate responses to same-case words compared to mixed-case words; nonwords showed the reverse pattern.
• Two semantic categorization experiments revealed no significant case-mixing effect for words.
• This suggests the effect is not linked to accessing word meaning.

Conclusions:

• The mixed-case effect in word recognition is primarily driven by a lack of visual familiarity.
• It does not result from difficulties in accessing lexical-semantic information.
• Visual processing, not semantic processing, underlies the disruption caused by mixed-case words.