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The effect of delay-lines on sequence recall - A study of B-RAAM
University of Skövde, School of Humanities and Informatics.
2005 (English)Independent thesis Advanced level (degree of Master (One Year))Student thesis
Abstract [en]

Connectionist models have been criticized for not being able to form compositional representations of recursive data structures such as trees and lists, a matter that has been addressed by models as Elman networks, RAAM and B-RAAM. These architectures seem to have common features with the human short-term memory regarding recall. Both show a strong recency effect; however, the human memory also exhibits a primacy effect due to rehearsal. The problem is that the connectionist models do not have the primacy aspect, which complicates the learning of long-term dependencies. A long-term dependency is when items presented early should affect the behaviour of the model. Learning long-term dependencies is a problem that is hard to address within these architectures.

Delay-lines might be used as a mechanism for implementing rehearsal within connectionist models. However, it has not been clarified how the use of delay-lines affects the recency and the primacy aspect. In this thesis, delay-lines are introduced in B-RAAM. This study investigates how the primacy and the recency aspect are affected by the use of delay-lines, aiming to improve the ability to identify long-term dependencies. The results show that by using delay-lines, B-RAAM has both primacy and recency.

Place, publisher, year, edition, pages
Skövde: Institutionen för kommunikation och information , 2005. , 51 p.
Keyword [en]
Long-term dependencies, primacy effect, delay-lines, B-RAAM
National Category
Computer Science
Identifiers
URN: urn:nbn:se:his:diva-1016OAI: oai:DiVA.org:his-1016DiVA: diva2:2128
Presentation
(English)
Uppsok
teknik
Supervisors
Available from: 2008-03-28 Created: 2008-03-28 Last updated: 2009-06-17

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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