The Role of Sparsely Distributed Representations in Familiarity Recognition of Verbal and Olfactory Materials

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Sikström, SverkerLund University,Lunds universitet,Institutionen för psykologi,Samhällsvetenskapliga institutioner och centrumbildningar,Samhällsvetenskapliga fakulteten,Department of Psychology,Departments of Administrative, Economic and Social Sciences,Faculty of Social Sciences (author)

LIBRIS-ID:oai:lup.lub.lu.se:6791ad84-51fe-447a-acdf-1517055054c8
https://lup.lub.lu.se/record/6791ad84-51fe-447a-acdf-1517055054c8URI
https://doi.org/10.1007/s10339-018-0862-9DOI
oai:researchportal.hkr.se/admin:publications/5bdba158-abd4-451d-8432-a3c5a150619eURI

We present the generalized signal detection theory (GSDT), where familiarity is described by a sparse binomial distribution of binary node activity rather than by normal distribution of familiarity. Items are presented in a distributed representation, where each node receives either noise only, or signal and noise. An old response (i.e., a ‘yes’ response) is made if at least one node receives signal plus noise that is larger than the activation threshold, and item variability is determined by the distribution of activated nodes as the threshold is varied. A distinct representation leads to better performance and a lower ratio of new to old item variability, than a more distributed and less distinct representations. Here we apply the GSDT to empirical data on verbal and olfactory memory and suggest that verbal memory relies on a distinct neural item representation whereas olfactory memory has a fuzzy neural representation leading to poorer memory and inducing a larger ratio of new to old item variability.

Hellman, JohanLund University,Lunds universitet,Institutionen för psykologi,Samhällsvetenskapliga institutioner och centrumbildningar,Samhällsvetenskapliga fakulteten,Department of Psychology,Departments of Administrative, Economic and Social Sciences,Faculty of Social Sciences(Swepub:lu)psyc-jnh (author)
Dahl, MatsLund University,Lunds universitet,Institutionen för psykologi,Samhällsvetenskapliga institutioner och centrumbildningar,Samhällsvetenskapliga fakulteten,Department of Psychology,Departments of Administrative, Economic and Social Sciences,Faculty of Social Sciences(Swepub:lu)psyk-mda (author)
Stenberg, GeorgLund University,Lunds universitet,Klinisk neurofysiologi,Sektion IV,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Clinical Neurophysiology,Section IV,Department of Clinical Sciences, Lund,Faculty of Medicine,Faculty of Education,Fakulteten för lärarutbildning(Swepub:lu)knfl-gst (author)
Johansson, MarcusKristianstad University,Department of Psychology,Avdelningen för psykologi(Swepub:hkr)09c2a705-8d5b-4b9b-bbb0-2f9e155612ad (author)
Institutionen för psykologiSamhällsvetenskapliga institutioner och centrumbildningar (creator_code:org_t)

In:Cognitive Processing: Springer Science and Business Media LLC19:4, s. 481-4941612-47821612-4790

By the author/editor: Sikström, Sverke ...; Hellman, Johan; Dahl, Mats; Stenberg, Georg; Johansson, Marcu ...

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