Hippocampal Circuits
Hippocampal Circuits - Related Videos
10:59
Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury
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Cited by 13 •
2012
A multi-faceted approach to investigating functional changes to hippocampal circuitry is explained. Electrophysiological techniques are described along with the injury protocol, behavioral testing and regional dissection method. The combination of these techniques can be applied in similar fashion for other brain regions and scientific questions.
11:37
Tuning in the Hippocampal Theta Band In Vitro: Methodologies for Recording from the Isolated Rodent Septohippocampal Circuit
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Cited by 4 •
2017
Here, we present a protocol for recording rhythmic neuronal network theta and gamma oscillations from an isolated whole hippocampal preparation. We describe the experimental steps from extraction of the hippocampus to details of field, unitary and whole-cell patch clamp recordings as well as optogenetic pacing of the theta rhythm.
08:52
Assaying Circuit Specific Regulation of Adult Hippocampal Neural Precursor Cells
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Cited by 6 •
2019
The goal of this protocol is to describe an approach for analyzing behavior of adult neural stem/progenitor cells in response to chemogenetic manipulation of a specific local neural circuit.
08:20
Organotypic Hippocampal Slice Cultures
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Cited by 52 •
2011
We describe a method to prepare organotypic hippocampal slices that can be easily adapted to other brain regions. Brain slices are laid on porous membranes and culture media is allowed to form an interface. This method preserves the gross architecture of the hippocampus for up to 2 weeks in culture.
09:27
RC/RL/LC Circuits
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Capacitors (C), inductors (L), and resistors (R) are each an important circuit element with distinct behaviors. A resistor dissipates energy and obeys Ohm's law, with its voltage proportional to its current. A capacitor stores electrical energy, with its current proportional to the rate of change of its voltage, while an inductor stores magnetic energy, with its voltage...
FAQs
Long-term potentiation (LTP) provides a mechanism for strengthening selected synaptic connections. When these connections become more effective, later activity can reflect prior experience more strongly, helping hippocampal circuits encode information rather than transmit all inputs unchanged. Because the strengthening is selective, LTP can support distinctions among experiences and contribute to memory formation.
The trisynaptic pathway organizes processing into successive stages: information enters from the entorhinal cortex, passes through the dentate gyrus and CA3, and then reaches CA1. This arrangement means information is relayed through connected regions rather than distributed uniformly. Examining activity across these stages helps researchers study how sensory and contextual information are integrated.
Hippocampal circuits combine sensory information with the context surrounding an experience. This integration helps explain their role in contextual learning, because an event can be represented together with the circumstances in which it occurred. It also supports retrieval by allowing later memory-related activity to reflect relevant context rather than isolated sensory details alone.
Researchers examine both the organization of the interconnected regions and their activity. Anatomical organization clarifies the entorhinal cortex, dentate gyrus, CA3, and CA1 sequence, while activity studies show how these networks participate in learning, memory consolidation, and retrieval. Considering structure and activity together provides a broader view of circuit function than either perspective alone.
In spatial navigation, researchers investigate how hippocampal network activity relates to the use of information about surroundings. In contextual learning, they examine how circumstances become associated with an experience. Studying both applications connects circuit organization and activity with important forms of learning and memory, extending analysis beyond isolated cellular connections.
Hippocampal circuits provide a framework for examining how dysfunction relates to neurological disease. In epilepsy, researchers can study the circuit-level consequences of abnormal hippocampal function; in Alzheimer’s disease, they can examine how hippocampal impairment bears on memory-related processes. These applications connect network organization and activity with clinically important problems in neuroscience.