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The thesis investigates the role of visual selective attention in processing distracting emotional material, focusing on the extent to which emotional stimuli are processed independently of attention. From an evolutionary perspective, quickly identifying emotionally salient information—such as danger and reward—enhances survival and reproductive success. While emotional stimuli likely receive priority in processing, the interaction between emotion and attention remains unclear. To explore these mechanisms, three experiments were conducted, requiring participants to focus on an attentional task while ignoring background emotional stimuli. In the first experiment, the impact of emotional distracters on an attentional task was assessed, emphasizing the time-course of this influence. Using steady-state visual evoked potentials (SSVEPs), results showed that both pleasant and unpleasant background images significantly interfered with task performance, indicated by reduced SSVEP amplitudes from approximately 270 ms to one second after picture onset. The second experiment utilized functional magnetic resonance imaging (fMRI) to examine emotional interference on specific brain areas, revealing decreased BOLD signals in task-related regions (e.g., V5/MT+) and increased signals in emotional processing areas (e.g., amygdala) across varying task difficulties. The final experiment further explored the influence of task difficulty on emoti
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Affective bias in visual selective attention, Catherine Hindi Attar
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- Erscheinungsdatum
- 2010
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