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Overlap between internal and external spatial attention over longer time intervals

Willems, Nick (2020) Overlap between internal and external spatial attention over longer time intervals.

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Abstract:The current study focuses on the difference and commonalities in both behavioral and neural activity between internal and external spatial attention. This was done by partially replicating a previous study by Van der Lubbe, Bundt, and Abrahamse (2014), with an extension regarding the robustness of internal spatial attentional process over time. It consisted of a pre-cue, and two post-cue conditions. Lateralized power spectra, reflecting both stimuli evoked, and internally induced effects were determined to examine the neural activity. Regarding the robustness of internal spatial attention over longer time intervals no hard evidence was found in behavioral data. lateralized power spectra analyses on the raw EEG data did not show hard evidence of deviations in lateralized alpha power in both post-cue conditions. Visual representations of the EEG data did show differences, suggesting there might be differences between the two. In the replication, responses were faster when the externally attended location corresponded with the required response side, with results suggesting this might also be the case for internally attended items. The lateralized power spectra analyses on the raw EEG data showed increased ipsilateral alpha power at occipito-temporal sites only for externally attended stimuli. These findings cannot definitively answer if internally induced attentional processes change over time, as there was no hard evidence to support this.
Item Type:Essay (Master)
Faculty:BMS: Behavioural, Management and Social Sciences
Subject:77 psychology
Programme:Psychology MSc (66604)
Link to this item:http://purl.utwente.nl/essays/80365
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