Thesis title: Early visual stimulus encoding and visual working memory
Supervisor: Dr Corinna Haenschel
Overview and research interests
Maciej's PhD research concerns visual working memory - the kind of memory that holds visual information for a short time, so that it can be later accessed and used in the absence of that information. He is interested in the earliest stage of this process - the encoding - when the image is "written" into memory. For that reason, his research concerns both memory and visual perception.
Considerable amount of work has been devoted to understanding early perceptual processes. However, traditional disciplinary boundaries have resulted in less work that would examine the relationship between low-level perception and working memory.
This is a promising area of research, especially if one considers findings from both neurophysiological and functional neuroimaging studies showing that working memory depends upon an extended network of neural areas. These include not only traditionally identified prefrontal and parietal regions, but also primary and higher sensory cortices.
In particular, he is investigating how luminance (L+M) and opponent chromatic (L-M and S-(L+M)) post-receptoral mechanisms contribute to the fidelity of encoded image, and whether those mechanisms can differentially affect performance in working memory tasks.
Because encoding into working memory is almost instantaneous, he is using electroencephalography (EEG). This technique allows him to investigate the neural dynamics of memory encoding as they unfold with time. This method is coupled with visual psychophysics, using stimuli highly controlled for chromaticity and luminance.
Maciej's more general interests extend to the role of neural synchrony (and asynchrony) in ongoing cognition, application of techniques with high temporal resolution (such as EEG) to explore questions of visual perception, as well as altered cognition in psychiatric disorders, such as schizophrenia.
- Visual neuroscience
- Electroencephalography (EEG)
- Visual perception
- Working memory
- Eye movements
Maciej has experience of:
- EEG data recording & analysis (worked with systems: Brain Products Germany, Biosemi ActiveTwo System,)
- Matlab (Mathworks): programming & experimental design, data analysis & visualisation
- Matlab toolboxes: Psychtoolbox (Brainard, 1997; Pelli, 1997; Kleiner et al, 2007), EEGLAB toolbox (Swartz Centre for Computational Neuroscience), CRS Toolbox (Cambridge Research Systems)
- ViSaGe MKII Visual Stimulus Generator
- Eye movement recording (Eyelink 1000 for detection of microsaccades)
- Monitor calibration, gamma correction using Spectroradiometer,
- ColourCal (Cambridge Research Systems)
- Vision assessment using: Metropsis & Cambridge Colour Test (Cambridge Research Systems), Colour Assessment and Diagnosis Test, AcuityPlus (City, University of London)
He has a Bsc Psychology from the University of Aberdeen (2011).
Publications and conference abstracts
- Kosilo, M., Wuerger, S. M., Craddock, M., Jennings, B. J., Hunt, A. R., & Martinovic, J. (2013). Low-level and high-level modulations of fixational saccades and high frequency oscillatory brain activity in a visual object classification task. Frontiers in psychology, 4.
- Kosilo, M., Haenschel, C., Martinovic, J. (2015). Preferential inputs of luminance signals for visual working memory. PERCEPTION, 44, 9-10.
- Martinovic, J., Kosilo, M., Wuerger, S. M., & Hunt, A. R. (2011). Induced gamma-band activity and fixational eye movements are differentially influenced by low-and high-level factors in a visual object classification task. i-Perception, 2(3), 187-187.
- Kosilo M., Hunt, A.R., Wuerger, S.M., Martinovic, J. (2011). Modulations of small fixational eye movements by low-level factors in a visual object classification task. In F. Vitu, E. Castet, & L. Goffart (Eds.), Abstracts of the 16th Conference on Eye Movements, Marseille, 21 - 25 August. Journal of Eye Movement Research, 4(3).
- Martinovic J., Kosilo M., Wuerger S.M. & Hunt, A. (2011). Induced gamma-band activity and fixational eye movements are differentially influenced by low and high-level factors in a visual object classification task. Frontiers in Human Neuroscience. Conference Abstract: XI International Conference on Cognitive Neuroscience (ICON XI).