What's the meaning of this? A behavioral and neurophysiological investigation into the principles behind the classification of visual emotional stimuli
Jazyk angličtina Země Spojené státy americké Médium print-electronic
Typ dokumentu časopisecké články, práce podpořená grantem
PubMed
27098919
DOI
10.1111/psyp.12662
Knihovny.cz E-zdroje
- Klíčová slova
- Categorization, Cluster analysis, Emotion, Intracerebral EEG, Semantic content,
- MeSH
- afekt fyziologie MeSH
- arousal MeSH
- dospělí MeSH
- elektroencefalografie MeSH
- emoce fyziologie MeSH
- lidé MeSH
- mladý dospělý MeSH
- mozková kůra fyziologie MeSH
- sémantika * MeSH
- shluková analýza MeSH
- zraková percepce fyziologie MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- mladý dospělý MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Two experiments were performed to investigate the principles by which emotional stimuli are classified on the dimensions of valence and arousal. In Experiment 1, a large sample of healthy participants rated emotional stimuli according to both broad dimensions. Hierarchical cluster analyses performed on these ratings revealed that stimuli were clustered according to their semantic content at the beginning of the agglomerative process. Example semantic themes include food, violence, nudes, death, and objects. Importantly, this pattern occurred in a parallel fashion for ratings on both dimensions. In Experiment 2, we investigated if the same semantic clusters were differentiated at the neurophysiological level. Intracerebral EEG was recorded from 18 patients with intractable epilepsy who viewed the same set of stimuli. Not only did electrocortical responses differentiate between these data-defined semantic clusters, they converged with the behavioral measurements to highlight the importance of categories associated with survival and reproduction. These findings provide strong evidence that the semantic content of affective material influences their classification along the broad dimensions of valence and arousal, and this principle of categorization exerts an effect on the evoked emotional response. Future studies should consider data-driven techniques rather than normative ratings to identify more specific, semantically related emotional images.
Institute of Psychology Academy of Sciences of the Czech Republic Brno Czech Republic
Institute of Scientific Instruments Academy of Sciences of the Czech Republic Brno Czech Republic
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