The Journal of Physiological Sciences

, Volume 65, Supplement 2, pp S17–S22 | Cite as

Gamma wave oscillation and synchronized neural signaling between the lateral hypothalamus and the hippocampus in response to hunger

  • Nifareeda Samerphob
  • Dania Cheaha
  • Surapong Chatpun
  • Ekkasit KumarnsitEmail author
Original Paper


The lateral hypothalamus plays an important role in homeostasis. It is sensitive to negative energy balance and believed to interact with other brain regions to mediate food seeking behavior. However, no neural signaling of hunger in the lateral hypothalamus has been studied. Male Swiss albino mice implanted with intracranial electrodes into the lateral hypothalamus and the hippocampus were randomly treated with drinking water for control condition, 18–20 h deprivation of food for hunger condition, and fluid food for satiety condition. Therefore, local field potential (LFP) and locomotor activity of animals were simultaneously recorded. One way ANOVA with Tukey’s post hoc test was used for statistical analysis. Frequency analysis of LFP revealed that food deprivation significantly increased the power of gamma oscillation (65–95 Hz) in the lateral hypothalamus and the hippocampus. However, satiety did not change the oscillation in these regions. Moreover, no significant difference among groups was observed for locomotor count and speed. The analysis of coherence values between neural signaling of these two brain areas also confirmed significant increase within a frequency range of 61–92 Hz for hunger. No change in coherence value was induced by satiety. In summary, this study demonstrated neural signaling of the lateral hypothalamus in response to hunger with differential power spectrum of LFP and the interplay with the hippocampus. The data may suggest critical roles of the lateral hypothalamus in detection of negative energy balance and coordination of other higher functions for food related learning or behaviors through the connectivity with the hippocampus.


Lateral hypothalamus Hippocampus Local field potential Hunger Energy balance 


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Copyright information

© The Physiological Society of Japan and Springer Japan 2015

Authors and Affiliations

  • Nifareeda Samerphob
    • 1
  • Dania Cheaha
    • 2
  • Surapong Chatpun
    • 3
  • Ekkasit Kumarnsit
    • 1
    Email author
  1. 1.Department of Physiology, Faculty of SciencePrince of Songkla UniversityHat Yai, SongkhlaThailand
  2. 2.Faculty of MedicinePrincess of Naradhiwas University (PNU)Meang, NarathiwatThailand
  3. 3.Institute of Biomedical Engineering, Faculty of MedicinePrince of Songkla UniversityHat Yai, SongkhlaThailand

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