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  4. Detektion und Identifikation von Figur-Grund-Unterschieden: Psychophysik, Elektrophysiologie und Magnetresonanztomographie
 
Zitierlink URN
https://nbn-resolving.de/urn:nbn:de:gbv:46-diss000114752

Detektion und Identifikation von Figur-Grund-Unterschieden: Psychophysik, Elektrophysiologie und Magnetresonanztomographie

Veröffentlichungsdatum
2009-05-25
Autoren
Straube, Sirko  
Betreuer
Fahle, Manfred  
Gutachter
Bach, Michael  
Zusammenfassung
The dissertation deals with psychophysical and neural properties of figure-ground-segregation in humans i) using two types of visual cues (orientation and spatial frequency) and ii) two types of tasks (detection and identification). The effect of visual cue combination is investigated separately for detection and identification using psychophysical and ERP measurements to evaluate how the combination itself and/or the perceived figure saliency influence the ERP. As a result, it was found in both studies that the neural response at 200 ms reflected saliency-changes rather than physical cue configuration. The comparison of detection and identification was investigated by combining psychophysics and fMRI. Pronounced differences between detection and identification were found i) in the psychophysical thresholds and the reaction times, and ii) in the BOLD responses. In summary, the results indicate at least partly separated cortical mechanisms for object detection and identification.
Schlagwörter
human

; 

ERP

; 

fMRI

; 

psychophysics

; 

cue combination

; 

detection

; 

identification

; 

vision

; 

figure-ground segregation

; 

object recognition

; 

saliency

; 

cortex-based alignment

; 

signal detection theory

; 

time-frequency analysis
Institution
Universität Bremen  
Fachbereich
Fachbereich 02: Biologie/Chemie (FB 02)  
Dokumenttyp
Dissertation
Zweitveröffentlichung
Nein
Sprache
Deutsch
Dateien
Lade...
Vorschaubild
Name

00011475.pdf

Size

6.09 MB

Format

Adobe PDF

Checksum

(MD5):b8b3434036226b3d69661218f399aa7a

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