Related Experiment Videos
Developmental amnesia associated with early hypoxic-ischaemic injury
D G Gadian1, J Aicardi, K E Watkins
1Radiology and Physics Unit, Institute of Child Health, London, UK. dgadian@ich.ucl.ac.uk
Brain : a Journal of Neurology
|February 25, 2000
Summary
Perinatal hypoxic-ischaemic injury can cause severe episodic memory loss in children. This developmental amnesia affects memory for events, not facts, and may be linked to hippocampal atrophy.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pediatric Neurology
Background:
- Episodic memory impairments in young patients were previously linked to early-life brain injury.
- Hypoxic-ischaemic (HI) injury during the perinatal period is a potential, unrecognized cause of such memory deficits.
Purpose of the Study:
- To investigate the hypothesis that perinatal HI injury can lead to severe episodic memory impairments.
- To characterize the neuropsychological and neuroanatomical profile of children with suspected HI-related memory deficits.
Main Methods:
- Neuropsychological assessments were conducted on five young patients with a history of perinatal HI episodes.
- Quantitative magnetic resonance imaging (MRI) was used to investigate brain structure, focusing on hippocampal volume and grey matter reductions.
Main Results:
- All five patients exhibited severe episodic memory impairments, with relatively preserved semantic memory.
- MRI revealed severe bilateral hippocampal atrophy in all patients.
- Group analysis showed bilateral grey matter reductions in the putamen and ventral thalamus.
Conclusions:
- Perinatal HI injury is a likely cause of selective episodic memory impairment (developmental amnesia) in these patients.
- The observed memory deficits result from selective damage to vulnerable brain regions, particularly the hippocampi, without severe global neurological impairment.
- These memory impairments can have significant long-term consequences, impacting academic and adult life.