Sajikumar, S., Frey, J.U. (2004): Resetting of 'synaptic tags' is time- and activity-dependent in rat hippocampal CA1 in vitro. Neuroscience. 129(2), pp. 503-507. [PubMed]

Navakkode, S., Sajikumar, S., Frey, J.U. (2004): The type IV-specific phosphodiesterase inhibitor rolipram and its effect on hippocampal long-term potentiation and synaptic tagging. J. Neurosci. 24(35), pp. 7740-7744. [PubMed]

Schott, B.H., Sellner, D.B., Lauer, C.J., Habib, R., Frey, J.U., Guderian, S., Heinze, H.J., Duzel, E. (2004): Activation of midbrain structures by associative novelty and the formation of explicit memory in humans. Learn. Mem. 11(4), pp. 383-387. [PubMed]

Sajikumar, S., Frey, J.U. (2004): Late-associativity, synaptic tagging, and the role of dopamine during LTP and LTD. Neurobiol. Learn. Mem. 82(1), pp.12-25. [PubMed]

Ahmed, T., Frey, S., Frey, J.U. (2004): Regulation of the phosphodiesterase PDE4B3-isotype during long-term potentiation in the area dentata in vivo. Neuroscience. 124(4), pp. 857-867. [PubMed]

Almaguer-Melian, W., Rojas-Reyes, Y., Alvare, A., Rosillo, J.C., Frey, J.U. and Bergado, R. (2005): Long-term potentiation in the dentate gyrus of freely moving rats is reinforced by intraventricular application of norepinephrine, but not oxotremorine. Neurobiol. Learn. & Memory 83, pp. 72-78. [PubMed]

Uzakov, S., Frey, J. U. and Korz, V. (2005): Cognitive reinforcement of rat hippocampal LTP. Learning & Memory in press.

Almaguer-Melian, W., Cruz-Aguado, R., de la Riva, C., Kendrick, K.M., Frey, J.U. and Bergado, J. (2005): Effect of LTP-reinforcing paradigms on neurotransmitter release in the dentate gyrus of young and aged rats. Biochem. & Biophys. Res. Comm. 327, pp. 877-883. [PubMed]

Leutgeb, J., Frey, J.U. and Behnisch, T. (2005): Single cell analysis of activity-dependent cAMP-responsive element-binding protein phosphorylation following the induction of long-lasting long-term potentiation in area CA1 of mature rat hippocampal organotypic cultures. Neuroscience in press.

Wittmann, B. C., Schott, B. H., Guderian, S., Frey, J.U., Heinze, H.-J. and Düzel, E. (2005): Reward-related fMRI activation of dopaminergic midbrain regions is associated with enhanced memory consolidation in the hippocampus. Neuron in press.

Korz, V. and Frey, J.U. (2005): Emotional and cognitive reinforcement of rat hippocampal long-term potentiation by different learning paradigms. Neuron Glia Biol. in press.