手法を比較

	暗黙的感情分析	否定検出
分野	テキストマイニング	テキストマイニング
系統	Process / pipeline	Process / pipeline
提唱年	2016 (aspect-level formulation); LLM-based reasoning formulation c. 2023	2001 (NegEx); scope learning formalised by 2009
提唱者	Rooted in aspect-level and deep-memory sentiment research; Tang et al. (2016) and Zhao et al. (2023) are key references	Chapman et al. (NegEx algorithm, 2001); Morante & Daelemans (scope learning, 2009)
種類	NLP text-classification task	NLP information-extraction task
原典	Zhao, W. et al. (2023). Is ChatGPT a Good Sentiment Reasoner? A Preliminary Study. arXiv preprint.	Chapman, W.W., Bridewell, W., Hanbury, P., Cooper, G.F., & Buchanan, B.G. (2001). A Simple Algorithm for Identifying Negated Findings and Diseases in Discharge Summaries. Journal of the American Medical Informatics Association, 8(6), 606-614.
別名	Örtük Duygu Analizi (Implicit Sentiment), implicit opinion mining, indirect sentiment detection	negation scope identification, negation cue detection, Olumsuzlama Tespiti (Negation Detection)
関連	3	6
概要	Implicit sentiment analysis detects indirect, context-dependent sentiment in text where no explicit opinion word is present — such as irony, metaphor, or understated criticism. Unlike standard sentiment analysis, which relies on surface-level polarity signals, this method interprets meaning from surrounding context, pragmatic cues, and world knowledge. It is typically addressed using large language models or fine-tuned transformers, drawing on work by Tang et al. (2016) on deep-memory aspect-level classification and Zhao et al. (2023) on LLM-based sentiment reasoning.	Negation detection is a natural-language-processing task that locates negation cues in text — words or phrases such as 'no', 'not', 'without', or 'denies' — and determines the span of text (the scope) whose meaning those cues invert. Formalised for clinical text by Chapman et al. (2001) with the NegEx algorithm and extended to scope learning in biomedical literature by Morante and Daelemans (2009), the method is essential wherever the difference between a finding being present and its being explicitly ruled out carries real consequences.