Am. Owen et al., VISUOSPATIAL SHORT-TERM RECOGNITION MEMORY AND LEARNING AFTER TEMPORAL-LOBE EXCISIONS, FRONTAL-LOBE EXCISIONS OR AMYGDALO-HIPPOCAMPECTOMY IN MAN, Neuropsychologia, 33(1), 1995, pp. 1-24
Three groups of neurosurgical patients with temporal lobe excisions, f
rontal lobe excisions or unilateral amygdalo-hippocampectomy were asse
ssed on a computerized battery of tasks designed to investigate visuo-
spatial short-term recognition memory and learning. A double dissociat
ion is reported between deficits of pattern recognition memory and spa
tial recognition memory which were observed in the two posterior group
s and frontal lobe patients, respectively. In addition, both the tempo
ral lobe and amygdalo-hippocampectomy patients were also impaired on a
delayed matching-to-sample paradigm whilst frontal lobe patients perf
ormed at an equivalent level to controls. Finally, whilst the impaired
performance of the three groups was indistinguishable on a test of pa
ired-associate learning, quite different patterns of deficit were obse
rved on a test of spatial working memory. These results are discussed
with reference to recent suggestions that visual recognition memory is
mediated by a neural system which includes, as major components, the
inferotemporal cortex, the medial temporal lobe structures and particu
lar sectors of the frontal lobe, and are compared to previous findings
from patients with idiopathic Parkinson's disease and dementia of the
Alzheimer type.