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Functionally Separable Font-invariant and Font-sensitive Neural Populations in Occipitotemporal Cortex.

Zhiheng Zhou¹, Tutis Vilis², Lars Strother¹

¹University of Nevada, Reno.

Journal of Cognitive Neuroscience

|April 3, 2019

Summary

This summary is machine-generated.

Brain imaging reveals distinct neural mechanisms for recognizing words regardless of font. The visual word form area in the left occipitotemporal cortex enables font-invariant word recognition, separating it from font-sensitive shape processing.

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Area of Science:

Neuroscience
Cognitive Neuroscience
Visual Perception

Background:

Reading requires rapid visual word recognition across diverse fonts.
Neural mechanisms underlying font-invariant word recognition are not fully understood.

Purpose of the Study:

To identify neural populations involved in font-invariant word recognition using fMRI.
To distinguish between font-invariant and font-sensitive neural responses in word processing.

Main Methods:

Functional magnetic resonance imaging (fMRI) was employed.
Participants viewed repeated words presented in identical or changing fonts.
Repetition suppression and font-sensitive release from suppression were measured.

Main Results:

Font-invariant repetition suppression was observed in the left occipitotemporal cortex (OT), including the visual word form area and middle occipital gyrus.
Shape-selective lateral occipital cortex and posterior fusiform showed font-sensitive responses.
The visual word form area demonstrated a greater degree of font invariance than font sensitivity.

Conclusions:

Neural mechanisms for font-invariant word recognition are anatomically distinct from font-sensitive shape processing areas within the left OT.
Font-invariant representation of visual word form is supported by multiple, distinct neural mechanisms in the left OT.