Task modulates the orthographic and phonological representations in the bilateral ventral Occipitotemporal cortex

Area of Science:

• Neuroscience
• Cognitive Science
• Psycholinguistics

Background:

• The left ventral occipitotemporal cortex, particularly the visual word form area (VWFA), is crucial for reading.
• Its precise role in orthographic processing versus interactive frameworks remains debated due to varying definitions and tasks across studies.

Purpose of the Study:

• To investigate information representation within the VWFA using representational similarity analysis (RSA).
• To determine how different reading tasks modulate the function of the left ventral occipitotemporal cortex and VWFA.

Main Methods:

• Employed representational similarity analysis (RSA) on fMRI data from 24 subjects.
• Scanned participants during explicit (naming) and implicit (perceptual) reading tasks.
• Conducted region of interest (ROI)-based RSA focusing on the anterior occipitotemporal cortex and VWFA.

Main Results:

• Task modulated information representation in the bilateral anterior occipitotemporal cortex and VWFA.
• The naming task showed greater activation in phonological processing regions, while the perceptual task engaged visual cortex and default mode network.
• ROI-based RSA revealed enhanced orthographic and phonological representations in the VWFA during the naming task compared to the perceptual task.

Conclusions:

• Lexical representation in the VWFA is influenced by phonological processing demands.
• Findings support an interactive account of the VWFA's function in word reading.