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Basics of Multivariate Analysis in Neuroimaging Data
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Temporal dynamics of letter processing revealed by multivariate pattern analysis of EEG data.

Miguel Domingues1, Susana Araújo1, Tânia Fernandes1

  • 1Faculty of Psychology, Universidade de Lisboa, Alameda da Universidade, 1649-013 Lisboa, Portugal.

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|January 24, 2026
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Summary

Recognizing letters involves continuous brain processes, not discrete stages. Early visual processing of letters remains active throughout later stages of reading, supporting identification.

Keywords:
EEGLettersMVPAN1P2P3Visual processing

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Reading Science

Background:

  • Letter recognition is fundamental to reading.
  • The temporal dynamics of letter processing stages are not well understood.
  • Existing research suggests a hierarchy but lacks temporal detail.

Purpose of the Study:

  • To investigate the temporal organization of neural processes during single letter recognition.
  • To determine if letter recognition unfolds in discrete stages or a continuous cascade.
  • To explore the interaction between early perceptual and later orthographic processing.

Main Methods:

  • Multivariate pattern analysis (MVPA) applied to electroencephalography (EEG) data.
  • Adult readers (n=35) performed a one-back repetition detection task on letters and pseudoletters.
  • Multivariate temporal generalization and spatiotemporal searchlight analyses were employed.

Main Results:

  • Event-related potential (ERP) analyses showed differences between letters and pseudoletters in N1, P2, and P3 components.
  • Neural patterns distinguishing letters were generalizable from ~140 ms to 600 ms.
  • Despite generalization, the spatial configuration of contributing EEG channels evolved over time.

Conclusions:

  • Letter recognition is a continuous, interacting cascade, not discrete stages.
  • Early perceptual activity (N1) persists and interacts with later orthographic processing.
  • This sustained engagement supports efficient letter identification and reading expertise.