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Related Concept Videos

Understanding Memory01:19

Understanding Memory

Memory is the retention of information or experiences over time, facilitated through three main processes: encoding, storage, and retrieval. Encoding is the process of inputting information into the memory system. For instance, when listening to a lecture, watching a play, reading a book, or having a conversation, the brain is actively encoding information. This initial stage involves transforming sensory input into a form that can be processed and stored by the brain. Various factors, such as...
Mnemonic Devices01:23

Mnemonic Devices

Mnemonic devices are cognitive tools that facilitate memory retention by linking new information to familiar patterns or organizational strategies. These techniques are beneficial for remembering complex or lengthy sets of information by simplifying and structuring them in easily retrievable ways.
Acronyms
Acronyms are created by using the initial letters of a series of words to form a new word or phrase. This approach condenses complex information into a single, memorable entity. For example,...
Explicit Memories01:27

Explicit Memories

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.
Episodic memory contains information about personally experienced events and is reported as a story. An example of episodic memory is recalling a birthday celebration. This type of memory includes the what, where, and when of an event, as...
Working Memory01:24

Working Memory

Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this information.
Role of Hippocampus in Memory01:19

Role of Hippocampus in Memory

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...
System of Memory01:23

System of Memory

Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory memory...

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Related Experiment Video

Updated: Jul 7, 2026

The Double-H Maze: A Robust Behavioral Test for Learning and Memory in Rodents
09:01

The Double-H Maze: A Robust Behavioral Test for Learning and Memory in Rodents

Published on: July 8, 2015

H.M.'s personal crossword puzzles: understanding memory and language.

Brian G Skotko1, David C Rubin, Larry A Tupler

  • 1Duke University, Durham, NC, USA. brian.skotko@childrens.harvard.edu

Memory (Hove, England)
|February 21, 2008
PubMed
Summary

Amnesic patient H.M. maintained excellent crossword skills, showing intact lexical word retrieval. His lifelong puzzle-solving suggests language abilities can persist without intact medial temporal lobe structures.

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Published on: February 19, 2018

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Linguistics

Background:

  • Patient H.M. suffered profound anterograde amnesia following medial temporal lobe resection.
  • Despite his memory deficits, H.M. engaged in lifelong crossword puzzle solving.

Observation:

  • Analysis of 277 crossword puzzle solutions by H.M. was conducted.
  • H.M.'s performance was evaluated for orthographic, grammatical, and lexical accuracy.

Findings:

  • H.M. demonstrated strong performance in spelling and grammar, with few errors.
  • His lexical word-retrieval skills were fluid, often surpassing answer key accuracy.
  • This suggests preserved written language comprehension and production abilities.

Implications:

  • Intact medial temporal lobe structures may not be essential for maintaining acquired written language skills.
  • Lexical retrieval and language processing can be resilient to severe memory impairment.
  • This challenges traditional models of memory and language interaction.