Neurocognitive Processing Laboratory, a part of Cognitive Science Department at Jagiellonian University in Krakow, is run by the group of researchers and students interested in the mechanisms and functions of cognition. Especially, we are investigating such cognitive processes as executive control, self-control, visual perception, working memory, relational reasoning (fluid intelligence), problem solving, learning, concepts, and language (e.g., bilingualism), but also work on various other topics like biological signal analysis or attention disorders (e.g. ADHD). In recent years, members of our group published over 20 papers in high impact, peer-reviewed journals, including:

We use the following research methods: behavioral experimentation, computational and statistical modeling, electroencephalography, eye-tracking, and optical spectroscopy. Our equipment includes:

NIRx spectroscope (NIRS) is a relatively new, non-invasive brain imaging technique measuring changes in cortical hemodynamic responses (oxygenated and de-oxygenated hemoglobin [Hb] levels) via detection of the attenuation of near-infra-red light waves passing through tissue. Although NIRS has a few limitations (e.g., explores 2-3 cm of outer cortex), it constitutes a very good compromise between powers of EEG and fMRI. At the same time, NIRS has some unique advantages, including low cost measurement, artifact robustness, imaging two subjects at the same time, and easy data analysis.

Biosemi ACTIVE2 BASE EURO is one of the newest generation of EEG systems, specifically designed to be used in scientific research applications. It allows non-invasive registration of brain electrical activity, with excellent (millisecond) temporal resolution. It contains a set of 64 active electrodes, registering the electrical potential at the surface of the scalp, and additionally 16 peripheral electrodes. The system is suitable for use in polygraphic registration, including electroencephalography, electromyography, electrocardiography and electrodermal response measurement. It means that apart from the EEG registration, it can be use to record the electrical activity produced by skeletal muscles, peripheral nerves, cardiac muscle, as well as to measure galvanic skin response.

EyeLink 1000 Plus eye-tracking equipment, which allows for measuring eye fixations with .05 degree spatial accuracy and 500 Hz temporal resolution. Data analysis software provides a researcher with individual and aggregate data analysis like heat maps, scan paths, and time plots, as well as eye sample, fixation, saccade, and interest area reports, and the like (for further use in statistical analyses).

With four parameters I can fit an elephant, and with five I can make him wiggle his trunk.

John von Neumann


Recent publications

Chuderski, A., & Andrelczyk, K. (2015). From neural oscillations to complex cognition: Simulating the effect of the theta-to-gamma cycle length ratio on analogical reasoning. Cognitive Psychology, 76, 78-102.

Chuderski, A., & Smolen, T. (2016). An integrated utility-based model of conflict evaluation and resolution in the Stroop task. Psychological Review, 123(3), 255-290.

Senderecka, M. (2016) Threatening visual stimuli influence response inhibition and error monitoring: An event-related potential study, Biological Psychology, 113, 24-36.

Smolen, T., & Chuderski, A. (2015). The quadratic relationship between difficulty of intelligence test items and their correlations with working memory. Frontiers in Psychology, 6:1270, 1-13.


Our recent research on fluid intelligence has been presented on Scientific American's webpage.