Speaker: Qi Chen, Ph.D Professor, South China Normal University
Time: 2018-01-22 10:00 - 11:30
Venue: Room 1113, Wang Kezhen Building
Abstract: Impaired object naming is a core deficit in post-stroke aphasia, which can manifest as errors of commission – producing an incorrect word or a nonword – or as errors of omission – failing to attempt to name the object. Detailed behavioral, computational, and neurological investigations of errors of commission have played a key role in development of neurocognitive models of word production. In contrast, the neurocognitive basis of omission errors is radically underspecified despite being a prevalent phenomenon in aphasia and other populations. The prevalence of omission errors makes their neurocognitive basis important for characterizing an individual’s deficits and, ideally, for personalizing treatment and evaluating treatment outcomes. The present study leveraged established relationships between lesion location and errors of commission to investigate omission errors in picture naming. Omission error rates from the Picture Naming Test for 123 individuals with post-stroke aphasia were analyzed using support vector regression lesion-symptom mapping. Omission errors were most strongly associated with left frontal and mid-anterior temporal lobe lesions. Computational model analysis further showed that omission errors were positively associated with impaired semantically-driven lexical retrieval rather than phonological retrieval. These results suggest that errors of omission in aphasia predominantly arise from lexical-semantic deficits in word retrieval and selection from a competitor set.
Host: Prof. Fang
報(bào)告人簡介：陳琦，教授、博士生導(dǎo)師，比利時(shí)根特大學(xué)心理學(xué)博士。2016年入選首批廣東省青年珠江學(xué)者，2017年入選“廣東特支計(jì)劃”百千萬工程青年拔尖人才項(xiàng)目。長期致力于建立語言和數(shù)學(xué)認(rèn)知的計(jì)算模型。近五年主持和參與國家自然科學(xué)（社會(huì)科學(xué)）基金項(xiàng)目4項(xiàng)和2項(xiàng)省部級(jí)項(xiàng)目。目前已Psychological Review，Nature Communications和Cognitive Psychology 等學(xué)術(shù)期刊發(fā)表多篇研究論文。成果獲廣東省哲學(xué)社會(huì)科學(xué)優(yōu)秀成果一等獎(jiǎng)。
