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Related Concept Videos

Role of Hippocampus in Memory01:19

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The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
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Cognitive enhancers, also known as "smart drugs," are substances used to enhance memory, mental alertness, and concentration. These can be natural or synthetic and improve cognition in conditions like Alzheimer's disease (AD) and other neurodegenerative diseases. Some common examples include caffeine, amphetamines, methylphenidate, modafinil, arecoline, donepezil, vortioxetine, and piracetam. These enhancers work on the principle of synaptic plasticity and altered circuit function.
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Related Experiment Video

Updated: Dec 11, 2025

Assessment of Memory Function in Pilocarpine-induced Epileptic Mice
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Minocycline differentially modulates human spatial memory systems.

Sam C Berens1, Chris M Bird1, Neil A Harrison2,3

  • 1School of Psychology, University of Sussex, Falmer, BN1 9QH, UK.

Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology
|August 26, 2020
PubMed
Summary
This summary is machine-generated.

Minocycline, an antibiotic targeting microglia, impaired human spatial memory and navigation performance. This study found minocycline disrupted striatal processing, leading to decreased overall performance in healthy adults.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Pharmacology

Background:

  • Microglia are crucial for learning and memory, and implicated in Alzheimer's disease.
  • Minocycline inhibits microglial activation and shows promise in rodent models for enhancing memory.
  • Previous research has not investigated minocycline's effects on human memory.

Purpose of the Study:

  • To investigate the effects of minocycline on human spatial memory and navigation.
  • To explore minocycline's impact on hippocampal and striatal learning mechanisms.
  • To determine if rodent findings translate to human cognitive function.

Main Methods:

  • A double-blind, randomized crossover study with 20 healthy male participants.
  • Participants received either minocycline (150 mg twice daily) or placebo for 3 days.
  • fMRI task assessing boundary- and landmark-based navigation during each condition.

Main Results:

  • Minocycline biased navigation towards boundary-based information, impairing landmark-based navigation.
  • Overall spatial memory performance decreased significantly with minocycline treatment.
  • Minocycline reduced brain activity during memory encoding in the caudate and other cortical regions, not the hippocampus.

Conclusions:

  • Minocycline impairs human spatial memory performance.
  • The drug likely disrupts striatal processing, increasing reliance on boundary-based navigation.
  • Findings suggest minocycline's effects in humans differ from rodent models, warranting caution in clinical applications.