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Johansson, Marcus
Publications (2 of 2) Show all publications
Sikström, S., Hellman, J., Dahl, M., Stenberg, G. & Johansson, M. (2018). The role of sparsely distributed representations in familiarity recognition of verbal and olfactory materials. Cognitive Processing, 19(4), 481-494
Open this publication in new window or tab >>The role of sparsely distributed representations in familiarity recognition of verbal and olfactory materials
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2018 (English)In: Cognitive Processing, ISSN 1612-4782, E-ISSN 1612-4790, Vol. 19, no 4, p. 481-494Article in journal (Refereed) Published
Abstract [en]

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.

Keywords
Memory, Model, Olfactory, Receiver operating characteristic (ROC), Recognition, Signal detection theory, Verbal
National Category
Psychology
Identifiers
urn:nbn:se:hkr:diva-18013 (URN)10.1007/s10339-018-0862-9 (DOI):000446545400002 ()29679290 (PubMedID)
Available from: 2018-04-25 Created: 2018-04-25 Last updated: 2018-10-25Bibliographically approved
Buratti, S., Allwood, C. M. & Johansson, M. (2014). Stability in the metamemory realism of eyewitness confidence judgments. Cognitive Processing, 15(1), 39-53
Open this publication in new window or tab >>Stability in the metamemory realism of eyewitness confidence judgments
2014 (English)In: Cognitive Processing, ISSN 1612-4782, E-ISSN 1612-4790, Vol. 15, no 1, p. 39-53Article in journal (Refereed) Published
National Category
Psychology
Identifiers
urn:nbn:se:hkr:diva-14640 (URN)10.1007/s10339-013-0576-y (DOI)
Available from: 2015-09-21 Created: 2015-09-21 Last updated: 2017-12-04Bibliographically approved
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