Project members

Susanna Bernstrup, Robin Hellerstedt & Mikael Johansson

Project overview

The objective of this project is to advance understanding of how semantic memory (language, general knowledge) affects learning of new information, and influences encoding and retrieval of episodic memories (personal past experiences). We combine behavioral measures and electrophysiological measures of brain activity (EEG/ERP) to investigate the neurocognitive basis of such memory-system interactions, with a particular emphasis on their temporal dynamics.

Memory retrieval fundamentally depends on the interaction between a cue and stored memory traces. Because any given cue typically activates multiple memories, remembering a particular fact or episode is challenged by interference from currently irrelevant memory representations. The present project investigates mechanisms recruited to resolve such interference during selective memory retrieval.

Publications and conference presentations

Hellerstedt, R. & Johansson, M. (2013). Electrophysiological correlates of competitor activation predict retrieval-induced forgetting. Cerebral Cortex. doi:10.1093/cercor/bht019

Hellerstedt, R. & Johansson, M. (2013). Blocking or Inhibition? An ERP Study of the Neural Mechanisms Underlying Retrieval-Induced Forgetting. 13th European Congress of Psychology (ECP 2013), Stockholm, Sweden.

Hellerstedt, R. & Johansson, M. (2012). Electrophysiological correlates of competitor activation predict individual differences in retrieval-induced forgetting. Dubrovnik Conference on Cognitive Science – DuCog IV, Dubrovnik, Croatia.

Hellerstedt, R. & Johansson, M. (2012). Selective semantic memory retrieval: Electrophysiological correlates of interference. Tagung experimentell arbeitender Psychologen TeaP 2012, Mannheim, Germany.

Hellerstedt, R., Rasmussen, A., & Johansson, M. (2012). Semantic category norms. Lund Psychological Reports, 12(3), 1–96.

Sikström, S., Johansson, M., & Waldhauser, G. (2012). The Spike-Time-Dependent Plasticity Model of Retrieval Induced Forgetting. 30th International Congress of Psychology (ICP), Cape Town, South Africa.

Johansson, M. & Hellerstedt, R. (2011). Selective semantic retrieval induces episodic forgetting: An event-related potential (ERP) approach. The 5th International Conference on Memory (ICOM5), York, UK.

Bernstrup, S., & Johansson, M. (2010). Electrophysiological correlates of voice memory: Effects of verbal overshadowing and auditory expertise. Ear-witness Symposium, Lund University.

Johansson, M., Hellerstedt, R., & Nilsson, S. (2010). Semantic generation induces episodic forgetting: An event-related potential study. Poster presented at the 17th Annual Meeting of the Cognitive Neuroscience Society, Montréal, Canada.