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Abstract:
Abstract: Approximately 50% of the survivors of sudden
cardiac arrest exhibit moderate to severe memory impairments. Such
hypoxic episodes result in tissue damage that is often specific to
fields of the hippocampus proper. The implications if this type of
damage are important for testing theories regarding how declarative
memory is organized in the medial temporal lobe. Specifically, does
a single- or dual-factor model best describe the relationship
between recall and recognition performance in these individuals? In
this study, a covariance structure model was fit to the covariance
matrix produced from two repeated recall and recognition tests as
well as age and cardiopulmonary resuscitation variables in a sample
of 56 cardiac arrest survivors. A single-factor model of memory
performance was rejected in favor of one that included separate,
but correlated recall and recognition factors, each of which was
uniquely influenced by age and time to awakening. The results are
most consistent with dual-process models of explicit memory (e.g.,
Yonelinas et al., 1998) and support the existence of a further
subdivision within the medial temporal lobe system (e.g., Aggleton
& Brown, 1999).
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