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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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Explicit memories, also known as declarative memories, are consciously remembered, recalled, and reported. Studying for a chemistry exam involves material that will become part of explicit memory. There are two types of explicit memory: episodic and semantic.
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Related Experiment Video

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A Real-world What-Where-When Memory Test
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Episodic-like memory is preserved with age in cuttlefish.

Alexandra K Schnell1,2,3, Nicola S Clayton2, Roger T Hanlon3

  • 1Normandie Univ., UNICAEN, Univ Rennes, CNRS, UMR EthoS 6552, Caen, France.

Proceedings. Biological Sciences
|August 17, 2021
PubMed
Summary

Episodic memory, crucial for recalling past events, remains intact in aged cuttlefish, unlike in humans and other mammals. This suggests that memory decline with age may not require a hippocampus.

Keywords:
ageingcephalopod cognitioncomparative cognitionsemantic-like memorytime-place learningwhat–where–when memory

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Cognitive Science

Background:

  • Episodic memory, essential for recalling specific past experiences, declines with age in humans and mammals.
  • This age-related memory decline is often linked to hippocampal function, but its occurrence in species lacking a hippocampus is unknown.
  • Cuttlefish, molluscs without a hippocampus, offer a unique model to study age-related memory changes.

Purpose of the Study:

  • To investigate whether episodic-like memory deteriorates with age in cuttlefish, a species lacking a hippocampus.
  • To compare the performance of sub-adult and aged cuttlefish in both semantic-like and episodic-like memory tasks.
  • To determine if the absence of a hippocampus influences age-related memory decline.

Main Methods:

  • Cuttlefish (n=6 per cohort) were divided into sub-adult and aged groups.
  • Semantic-like memory was tested by associating food location with time of day.
  • Episodic-like memory was assessed by requiring recall of what-where-when information for a foraging task.

Main Results:

  • Semantic-like memory performance was comparable between sub-adult and aged cuttlefish.
  • Episodic-like memory performance was also comparable, but aged cuttlefish reached the success criterion significantly faster than sub-adults.
  • Aged cuttlefish demonstrated preserved episodic-like memory, contrary to expectations based on other animal models.

Conclusions:

  • Episodic-like memory is preserved in aged cuttlefish, challenging the universal link between hippocampal function and age-related memory decline.
  • Memory deterioration with advancing age may be delayed or absent in species lacking a hippocampus.
  • Cuttlefish provide a novel model for understanding the evolution and neural basis of memory resilience.