Search PubMed⌕ Search
Home/Archive/PubMed

PubMed · 7697991

Completion in visuo-spatial neglect: a case study.

P W Halligan·J C Marshall
View original source ↗Export metadata ↓

Abstract

We present examples of copying and spontaneous drawing from a patient (P.B.) with hemianopia and severe neglect. The patient's drawings of butterflies show omission of the left side when the task is undertaken with the eyes open. By contrast, full butterflies are produced when P.B. draws with his eyes closed, and when he rotates the image to draw a horizontally-aligned figure. Unless specifically cued to the "neglected" side, the patient "believes" that his half-drawings are full drawings. Interpretations of the phenomena are provided in terms of normal perceptual completion.

Explore related subjects

Cerebral InfarctionCerebrovascular DisordersCognition DisordersFunctional LateralityHumansMaleMiddle AgedSpace PerceptionCase ReportsJournal ArticleResearch Support, Non-U.S. Gov't

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

P W Halligan, J C Marshall. 1994. Completion in visuo-spatial neglect: a case study.. https://doi.org/10.1016/s0010-9452(13)80244-4

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2002

[Does chronic periodontitis play a role in the pathogenesis of cardiovascular and cerebrovascular diseases?].

The role of chronic infections in the initiation of atherosclerotic lesions has been vividly discussed in recent years. A possible causal relationship between cardiovascular diseases and infections with, e. g., Chlamydia pneumoniae, Helicobacter pylori, or herpes viruses had also been established for chronic periodontitis, in particular after discovery of DNA of typical periodontal pathogens in atheromatous plaques. Especially in longitudinal epidemiologic studies, a low or moderate association between existing periodontitis and the development of, e. g., coronary heart disease or non-haemorrhagic stroke had been observed. In this article the respective literature is critically reviewed. In particular, the influence of incomplete or inappropriate adjustment for common risk factors for both diseases, i. e., cardiovascular disease and periodontitis should be analysed. In metaanalyses of prospective studies, in which the respective endpoint occurred after the investigation had commenced, relative risks of periodontitis of 1.12 (95 % confidence interval 0.95-1.33) for coronary heart disease and 1.73 (0.89-3.34) for ischaemic stroke were calculated. Whether chronic periodontitis actually represents an important risk for the development of cardiovascular diseases remains questionable. Already planned intervention studies appear to be premature and ethically highly problematic.

Cerebral Infarction↗
PubMed2002

Hanja alexia with agraphia after left posterior inferior temporal lobe infarction: a case study.

Korean written language is composed of ideogram (Hanja) and phonogram (Hangul), as Japanese consists of Kanji (ideogram) and Kana (phonogram). Dissociation between ideogram and phonogram impairment after brain injury has been reported in Japanese, but few in Korean. We report a 64-yr-old right-handed man who showed alexia with agraphia in Hanja but preserved Hangul reading and writing after a left posterior inferior temporal lobe infarction. Interestingly, the patient was an expert in Hanja; he had been a Hanja calligrapher over 40 yr. However, when presented with 65 basic Chinese letters that are taught in elementary school, his responses were slow both in reading (6.3 sec/letter) and writing (8.8 sec/letter). The rate of correct response was 81.5% (53 out of 65 letters) both in reading and writing. The patient's performances were beyond mean-2SD of those of six age-, sex-, and education-matched controls who correctly read 64.7 out of 65 and wrote 62.5 out of 65 letters with a much shorter reaction time (1.3 sec/letter for reading and 4.0 sec/letter for writing). These findings support the notion that ideogram and phonogram can be mediated in different brain regions and Hanja alexia with agraphia in Korean patients can be associated with a left posterior inferior temporal lesion.

Cerebral Infarction↗