Graspability in disguise: The cognitive and neural differences in processing words representing small and big...

Area of Science:

• Cognitive Neuroscience
• Psycholinguistics
• Neuroimaging

Background:

• Object size is a fundamental characteristic influencing perception and concept organization.
• Previous research shows distinct brain responses to visual object sizes and behavioral differences in processing words related to object size.
• It's unclear if these size-based neural and behavioral effects extend to symbolic word processing.

Purpose of the Study:

• To investigate cognitive and neural differences in processing words representing small versus big objects.
• To determine if object size or another dimension, like graspability, underlies these differences.
• To explore the temporal dynamics of these processes using electroencephalography (EEG).

Main Methods:

• A lexical decision task (LDT) and a semantic decision task (SDT) were employed.
• Behavioral data (reaction times) and neural responses (EEG) were collected for small and big words.
• Regression representational similarity analysis (RSA) was used to link neural patterns to conceptual dimensions.

Main Results:

• A potential, but not robust, behavioral advantage for processing big words was observed in the LDT, but not the SDT.
• Distinct EEG brain responses differentiated small and big words at 190-250 ms in both tasks, and at 390-520 ms in the SDT.
• RSA indicated that object graspability, rather than object size, explained the observed neural differences.

Conclusions:

• Cognitive and neural processes differ when reading words associated with small versus big objects.
• Object graspability emerges as a key factor influencing the processing of size-related words.
• Findings suggest a flexible, two-stage semantic processing mechanism and offer a new hypothesis for word processing advantages.