The hippocampus encodes delay and value information during delay-discounting decision making.

Area of Science:

• Neuroscience
• Decision-making research
• Cognitive neuroscience

Background:

• The hippocampus is vital for memory and navigation.
• Its role in delay discounting (reduced reward value over time) is unclear.
• Understanding hippocampal delay information encoding is essential.

Purpose of the Study:

• To investigate how the hippocampus encodes delay information during decision-making.
• To identify neuronal subpopulations involved in delay discounting.
• To explore the role of N-methyl-D-aspartate receptors in this process.

Main Methods:

• Recorded neuronal activity in mouse CA1 during a delay-discounting task.
• Manipulated delay lengths, positions, and reward amounts.
• Genetically deleted N-methyl-D-aspartate receptors in hippocampal pyramidal cells.

Main Results:

• Identified hippocampal CA1 neuron subpopulations with firing rates modulated by delay.
• Neuronal activity reflected delay length, position, and reward amount.
• N-methyl-D-aspartate receptor deletion impaired decision-making and diminished delay-dependent activity.

Conclusions:

• Distinct hippocampal neuron subclasses support delay-discounting decisions.
• This process is dependent on N-methyl-D-aspartate receptor function.
• The hippocampus plays a key role in temporal valuation and decision-making.