Simultaneous Cortical Responses to Multiple Written Words

Area of Science:

• Neuroscience
• Cognitive Science
• Psycholinguistics

Background:

• Reading research has focused on single words.
• Processing multiple words simultaneously remains poorly understood.
• The simultaneous suppression paradigm investigates responses to multiple stimuli.

Purpose of the Study:

• To investigate how the brain processes multiple English words presented simultaneously.
• To compare brain responses to sequential versus simultaneous word presentations.
• To identify brain regions involved in simultaneous word processing.

Main Methods:

• fMRI study with participants viewing rapid sequences of frames.
• Varying the number of English words (zero, one, two sequentially, two simultaneously).
• Using pseudoletters matched to familiar letters and a behavioral detection task.

Main Results:

• Behavioral accuracy was lower for simultaneous than sequential word detection.
• BOLD responses in left hemisphere reading regions increased linearly with word count.
• Ventral temporal regions showed reduced sensitivity to lexical frequency for simultaneous words.

Conclusions:

• The reading network can detect simultaneous letter strings.
• Simultaneous word presentation causes interference during lexical access.
• This study elucidates the neural basis of processing multiple words in reading.