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The disruptive effects of processing fluency on familiarity-based recognition in amnesia
Jason D Ozubko1, Andrew P Yonelinas2
1Rotman Research Institute, Toronto, ON, Canada M6A 2E1.
Neuropsychologia
|December 24, 2013
Summary
Amnesia patients show impaired familiarity-based recognition when processing fluency is manipulated. This suggests that memory deficits in amnesia can disrupt the ability to discriminate between items based on fluency.
Area of Science:
- Cognitive Neuroscience
- Neuropsychology
Background:
- Amnesia impairs recollection but spares familiarity-based recognition.
- Familiarity is linked to processing fluency, but its response to fluency manipulation in amnesia is unknown.
Purpose of the Study:
- To investigate how amnesic patients respond to direct manipulations of processing fluency.
- To determine if processing fluency affects familiarity-based discrimination in medial temporal lobe (MTL) damage.
Main Methods:
- Manipulated processing fluency using semantically related/unrelated primes before test items.
- Measured recollection and familiarity using a remember-know recognition procedure in amnesic patients and healthy controls.
Main Results:
- Healthy controls showed increased familiarity responses with enhanced fluency, maintaining accuracy.
- Amnesic patients showed increased familiarity responses for new items but decreased accuracy, indicating impaired discrimination.
- This deficit in amnesia was specific to fluency manipulation and not due to general performance or recollection deficits.
Conclusions:
- Direct manipulation of processing fluency can disrupt familiarity-based discrimination in amnesia.
- Findings suggest that familiarity processing in amnesia is vulnerable to fluency changes, impacting recognition accuracy.
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