Cognitive NetSci

SNA@KDD

Cognitive Network Science is a recent interdisciplinary field involving the study of human cognition, whose subject of study is the human mental lexicon modeled as a networked entity of words/concepts, being these latter ones the basis for thought and communication. It arises as a complementary field to traditional psycholinguistic studies dedicated to the analysis of word’s properties only, such as valence, arousal, dominance, concreteness. Since several lines of research are implicitly moving towards the direction of feature-rich modelling, we claim that such a framework is a natural extension - or, better, a synthesis - of the layout proposed by current methodological cognitive network science studies.


  • Domain(s): Linguistics, Psychology, Cognitive Science, Computer Science;
  • System: Human Cognition, Mental Lexicon, Semantic Memory, Phonological Memory, Syntactic Knowledge;
  • Node: Concepts, Words or their sub-units, e.g. phonemes, morphemes;
  • Relation(s): Free associations, hyponym-hypernym, synonyms, antonyms, feature-sharing relations, phonological similarities, syntactic dependencies;
  • Topology:
    • Graph: words are pair-wise connected if they share a linguistic similarity, e.g., they are synonyms, they are recalled together in a word association task, or they co-occur in sentences;
    • Higher-order: data acquisition like co-occurrence methods naively allows to represent such relations as simplices and improve structural mining as in the discovery of knowledge gaps; in some word association tasks, participants are asked to give more than one associated responses to a cue word: an hyperedge can be formed between this triad, and an hypergraph consequently built;
  • Semantics:
    • Attributed: word length, word frequency in corpora or in child-directed speech, degree of polysemy, valence, arousal, dominance, concreteness constitute linguistic information that can be attached to the words; it is possible to relate these properties to words’ connectivity in the mental lexicon analyzing assortative mixing; – Multilayer: free associations, synonyms, phonological similarities, etc. constitute different layers of the human mental lexicon; it is possible to combine these linguistic levels and analyze them together to reveal complex patterns in early word acquisition or clusters of words used with greater frequency, memorized and learned more easily; – Dynamic: words are acquired earlier or later in the process of language acquisition, and word acquisition can be modelled as a process on a mental lexicon structure, like a random walk on a graph; the human mental lexicon characterizes as an evolving system, and its topology can be compared at different ages.

As it is possible to observe, many rich information is available from words with respect to their psycholinguistic properties as well as with respect to the relations and similarities with other words. Classic psycholinguistic studies focus on words’ properties only, whereas cognitive network science focus on the structure emerging from word connections, aiming to relate such connections to language functions and cognitive processes. Beyond this strong parallelism, feature-rich models can support the unification of such fragmented and parallel fields of research and the analyses they involve.

Objectives

Our research aims at three complementary goals:

  • develop a feature-rich network framework for the study of human cognition, the mental lexicon and language acquisition;
  • pursue data-driven research in the field of cognitive network science, using the developed tools/Algorithms to analyze data from psycholinguistic experiments;
  • define a sound methodologies to extract emotional profiles starting from user generated contents (UGCs).

Main Collaborations: Massimo Stella (CogNosco Lab)

Related (selected) publications

  1. Feature-rich multiplex lexical networks reveal mental strategies of early language learning
    Scientific Reports 2023
  2. Cognitive network neighbourhoods quantify feelings expressed in suicide notes and Reddit mental health communities
    Simmi Marina Joseph, Salvatore CitraroVirginia MoriniGiulio Rossetti, and Massimo Stella
    Physica A: Statistical Mechanics and its Applications 2022