Abstract
Relevance is a key topic in Information Retrieval (IR). It indicates how well the information retrieved by the search engine meets the user’s information need (IN). Despite research advances in the past decades, the use of brain imaging techniques to investigate complex cognitive processes underpinning relevance is relatively recent, yet has provided valuable insight to better understanding this complex human notion. However, past electrophysiological studies have mainly employed an event-related potential (ERP) component-driven approach. While this approach is effective in exploring known phenomena, it might overlook the key cognitive aspects that significantly contribute to unexplored and complex cognitive processes such as relevance assessment formation. This paper, therefore, aims to study the relevance assessment phenomena using a data-driven approach. To do so, we measured the neural activity of twenty-five participants using electroencephalography (EEG). In particular, the neural activity was recorded in response to participants’ binary relevance assessment (relevant vs. non-relevant) within the context of a Question Answering (Q/A) Task. We found significant variation associated with the user’s subjective assessment of relevant and non-relevant information within the EEG signals associated with P300/CPP, N400 and, LPC components, which confirms the findings of previous studies. Additionally, the data-driven approach revealed neural differences associated with the previously not reported P100 component, which might play important role in early selective attention and working memory modulation. Our findings are an important step towards a better understanding of the cognitive mechanisms involved in relevance assessment and more effective IR systems.
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Notes
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- 2.
To assess the difficulty level, two annotators separately judged question difficulty (i.e. difficult vs easy). The overall inter-annotator agreement was reasonably high (Cohen’s kappa, \(\kappa \) = 0.72).
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- 4.
We removed 38 peripheral channels: E1, E8, E14, E17, E21, E25, E32, E38, E43, E44, E48, E49, E56, E57, E63, E64, E68, E69, E73, E74, E81, E82, E88, E89, E94, E95, E99, E100, E107, E113, E114, E119, E120, E121, E125, E126, E127, E128.
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Region of Interest refers to a selected region of neighbouring electrodes that jointly and significantly contribute towards neurophysiological phenomena of interest.
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The terms LPC and P600 are commonly interchanged. Relevance assessment has frequently been linked to the P600 ERP component (e.g. [14]. However, the P600 component is mainly associated with ‘syntactic re-analyses’ in language studies. Therefore, the label LPC might be more appropriate to use while focusing on relevance assessment, as the LPC has been linked to memory and recognition processes.
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This work was supported by the Engineering and Physical Sciences Research Council [grant number EP/R513349/1].
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Pinkosova, Z., McGeown, W.J., Moshfeghi, Y. (2023). Revisiting Neurological Aspects of Relevance: An EEG Study. In: Nicosia, G., et al. Machine Learning, Optimization, and Data Science. LOD 2022. Lecture Notes in Computer Science, vol 13811. Springer, Cham. https://doi.org/10.1007/978-3-031-25891-6_41
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