title: Hippocampal theta wave activity during configural and non-configural tasks in rats.
abstract: This study examined hippocampal theta power during configural and non-configural tasks in rats. Experiment 1 compared hippocampal theta power during a negative patterning task (A+, B+, AB-) to a configural task and a simple discrimination task (A+, B-) as a non-configural task. The results showed that hippocampal theta power during the non-reinforcement trial (non-RFT) of the negative patterning task was higher than that during the simple discrimination task. However, this hippocampal power may reflect sensory processing for compound stimuli that have cross-modality features (the non-RFT of the negative patterning task was presented together with visual and auditory stimuli, but the non-RFT of the simple discrimination task was presented with visual or auditory stimulus alone). Thus, in experiment 2, we examined whether the experiment 1 results were attributable to sensory processing of a compound stimulus by comparing hippocampal theta power during negative patterning (A+, B+, AB-), simultaneous feature-negative (A+, AB-), and simple discrimination tasks (A+, B-). Experiment 2 showed that hippocampal theta activity during the non-RFT in the negative patterning task was higher than that in the simultaneous feature-negative and simple discrimination tasks. Thus, we showed that hippocampal theta activity increased during configural tasks but not during non-configural tasks.
authors.affiliation: Graduate School of Integrated Arts and Sciences, Hiroshima University, Kagamiyama 1-3-2, Higashi-Hiroshima-shi, Hiroshima-ken, 739-8521, Japan. yuyasakimoto@gmail.com
authors.forename: Yuya
authors.initials: Y
authors.lastname: Sakimoto
authors.forename: Minoru
authors.initials: M
authors.lastname: Hattori
authors.forename: Kozue
authors.initials: K
authors.lastname: Takeda
authors.forename: Kana
authors.initials: K
authors.lastname: Okada
authors.forename: Shogo
authors.initials: S
authors.lastname: Sakata
mesh_terms: D000818:Animals; D003216:Conditioning, Operant / Q000502:physiology*; D004193:Discrimination Learning / Q000502:physiology*; D004192:Discrimination, Psychological / Q000502:physiology*; D004569:Electroencephalography; D006624:Hippocampus / Q000502:physiology*; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D012054:Reinforcement, Psychology; D013826:Theta Rhythm / Q000502:physiology*