Experience-dependent Changes in the Visual Processing of Letters: Evidence from Electroencephalography Decoding.

Area of Science:

• Neuroscience
• Cognitive Science
• Visual Processing

Background:

• Reading acquisition involves developing letter representations.
• The timing of orthographic tuning's influence on visual processing remains unclear.

Purpose of the Study:

• To investigate if reading experience impacts early visual processing of letters.
• To differentiate between enhanced and degraded processing of familiar (upright) versus unfamiliar (inverted) letter forms.

Main Methods:

• Electroencephalography (EEG) was used to record brain activity.
• Univariate analyses examined event-related potentials (P1, N170).
• Multivariate pattern classification (decoding) assessed neural signal information content.

Main Results:

• Inverted letters showed larger P1 and N170 amplitudes than upright letters.
• Decoding accuracy for upright letters was higher in early visual processing (P1 range).
• Decoding accuracy for inverted letters surpassed upright letters later (N170 onwards).

Conclusions:

• Reading experience enhances early visual feature extraction for familiar upright letters.
• Later visual processing shows increased discriminability for less familiar inverted letters.
• Orthographic tuning influences both early and later stages of visual processing.