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H.M. revisited: relations between language comprehension, memory, and the hippocampal system
D G MacKay1, R Stewart, D M Burke
1Univeristy of California Los Angeles Psychology Department Los Angeles CA US 90024, USA. mackay@psych.ucla.edu
Journal of Cognitive Neuroscience
|December 31, 1998
Summary
The patient H.M. has impaired language comprehension, challenging the notion of a "pure memory deficit." His difficulties with ambiguous sentences suggest memory and language processing are interconnected.
Area of Science:
- Neuroscience
- Cognitive Science
- Psycholinguistics
Background:
- The widely accepted view of patient H.M. posits a "pure memory deficit" with intact language comprehension.
- This study investigates H.M.'s language processing abilities, specifically his capacity to understand ambiguous sentences, compared to memory-normal controls.
Observation:
- H.M. demonstrated significantly lower accuracy in identifying ambiguous sentences compared to controls across two studies.
- He required substantial assistance to identify sentence meanings and struggled with understanding instructions and his own utterances.
Findings:
- The results indicate that H.M.'s memory impairment extends to language comprehension, contradicting the "pure memory deficit" hypothesis.
- A patient with different brain damage (bilateral frontal lobe) did not exhibit similar language comprehension deficits, ruling out brain damage per se or cohort effects.
Implications:
- The findings support "distributed-memory theories," suggesting that semantic-level binding processes are crucial for both memory and language.
- This challenges "stages-of-processing theories" by demonstrating that memory storage deficits can impact language comprehension, necessitating a more integrated view of cognitive functions.