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ERIC Number: EJ1064864
Record Type: Journal
Publication Date: 2015-Jun
Pages: 11
Abstractor: As Provided
Reference Count: N/A
ISSN: ISSN-1072-0502
Phase Matters: Responding to and Learning about Peripheral Stimuli Depends on Hippocampal ? Phase at Stimulus Onset
Nokia, Miriam S.; Waselius, Tomi; Mikkonen, Jarno E.; Wikgren, Jan; Penttonen, Markku
Learning & Memory, v22 n6 p307-317 Jun 2015
Hippocampal ? (3-12 Hz) oscillations are implicated in learning and memory, but their functional role remains unclear. We studied the effect of the phase of local ? oscillation on hippocampal responses to a neutral conditioned stimulus (CS) and subsequent learning of classical trace eyeblink conditioning in adult rabbits. High-amplitude, regular hippocampal ?-band responses (that predict good learning) were elicited by the CS when it was timed to commence at the fissure ? trough (Trough group). Regardless, learning in this group was not enhanced compared with a yoked control group, possibly due to a ceiling effect. However, when the CS was consistently presented to the peak of ? (Peak group), hippocampal ?-band responding was less organized and learning was retarded. In well-trained animals, the hippocampal ? phase at CS onset no longer affected performance of the learned response, suggesting a time-limited role for hippocampal processing in learning. To our knowledge, this is the first study to demonstrate that timing a peripheral stimulus to a specific phase of the hippocampal ? cycle produces robust effects on the synchronization of neural responses and affects learning at the behavioral level. Our results support the notion that the phase of spontaneous hippocampal ? oscillation is a means of regulating the processing of information in the brain to a behaviorally relevant degree.
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A