Consistent Gradient of Performance and Decoding of Stimulus Type and Valence from Local and Network Activity

Eugenia Hesse, Ezequiel Mikulan, Jacobo D. Sitt, María Del Carmen Garcia, Walter Silva, Carlos Ciraolo, Esteban Vaucheret, Federico Raimondo, Fabricio Baglivo, Federico Adolfi, Eduar Herrera, Tristán A. Bekinschtein, Agustín Petroni, Sergio Lew, Lucas Sedeño, Adolfo M. García, Agustín Ibáñez

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


The individual differences approach focuses on the variation of behavioral and neural signatures across subjects. In this context, we searched for intracranial neural markers of performance in three individuals with distinct behavioral patterns (efficient, borderline, and inefficient) in a dual-valence task assessing facial and lexical emotion recognition. First, we performed a preliminary study to replicate well-established evoked responses in relevant brain regions. Then, we examined time series data and network connectivity, combined with multivariate pattern analyses and machine learning, to explore electrophysiological differences in resting-state versus task-related activity across subjects. Next, using the same methodological approach, we assessed the neural decoding of performance for different dimensions of the task. The classification of time series data mirrored the behavioral gradient across subjects for stimulus type but not for valence. However, network-based measures reflected the subjects' hierarchical profiles for both stimulus types and valence. Therefore, this measure serves as a sensitive marker for capturing distributed processes such as emotional valence discrimination, which relies on an extended set of regions. Network measures combined with classification methods may offer useful insights to study single subjects and understand inter-individual performance variability. Promisingly, this approach could eventually be extrapolated to other neuroscientific techniques.

Original languageEnglish
Article number8663404
Pages (from-to)619-629
Number of pages11
JournalIEEE Transactions on Neural Systems and Rehabilitation Engineering
Issue number4
StatePublished - Apr 2019
Externally publishedYes


  • Emotional valence
  • facial processing
  • information sharing connectivity
  • intracranial recordings
  • lexical processing
  • multivariate analysis patterns


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