Thesis: Functional Hierarchy and Temporal Dynamics of Conscious and Unconscious Processes in Human Vision

 

Research Area: Cognitive Science, Neuroscience, Computational Biological Vision

·          Electroencephalography (EEG)

o         Correlates of visual awareness (conscious registration) assessed by visual masking

o         Signal analysis of visual evoked potential (VEP) 

o         Exploring correlates of masking in VEPs obtained from contra- ipsilateral sides

o         Have used Biosemi EEG machine and EEGLAB software

o         Related recent literature: Woodman & Luck (2003), Jaskowski et al. (2002)

·          Visual Attention

o         Temporal dynamics of visual attention

o         Deployment of attention

o         Priming and masking effect of peripheral cues

o         Related recent literature: Nakayama & Mackeben (1989)

·          Visual Masking

o         Information processing at unconscious and conscious levels

o         Locus of metacontrast masking with respect to that of binocular rivalry

o         Reaction time to masked and recovered stimuli

o         Related recent literature: Breitmeyer & Ogmen (2000)

·          Computational / Modeling

o         Modeling of visual masking and target recovery (disinhibition) phenomena

o         Simulations to account existing literature

o         Implementation of differential equations in MATLAB and C

o         Related recent literature: Ogmen et al. (2003)

 

Publications & Presentations:

 

§          Koç, A., Ogmen, H., & Breitmeyer,  B. G. Temporal dynamics of cueing effect: Attention, Masking, and Priming.

 

§          Koç, A., Ogmen, H., & Breitmeyer,  B. G. Electrophysiological correlates of visibility in visual masking.

 

§          Breitmeyer,  B. G., & Ogmen, H., & Koç, A. Binocular rivalry precedes metacontrast masking.

 

§          Breitmeyer,  B. G., & Ogmen, H., & Koç, A. (2005).  Functional hierarchy revealed by metacontrast masking and binocular rivalry, VSS’05: Vision Sciences Society Conference.

 

§         Koç, A., Breitmeyer,  B. G., & Ogmen, H. (2004).  Automatic Unconscious visual information processing stages in the brain: Metacontrast masking is after binocular rivalry, Texas Systems day, Houston, TX.

 

§          Koç, A., Ogmen, H., & Breitmeyer,  B. G. (2004).  Temporal Dynamics of Extrinsic Focal Visual Attention, The 21st  Annual Houston Conference on Biomedical Engineering Research.

 

§          Koç, A., & Arslan, L. M. (2002).  Robust Speech Recognition, The 10th Annual Applications of Signal Processing and Communication Conference.

 

 

Back