Things I'm interested in...

Image by Nikola Jovanovic

PROCESSING REAL-WORLD SCENES

Why are humans so efficient in processing complex visual environments? I'm particularly interested in how the structure of our everyday environments facilitates efficient brain processing and perception. 

Attentional Selection in Natural Scenes


Despite the cluttered nature of real-world scenes, humans are strikingly efficient in selecting behaviorally relevant objects over irrelevant, distracting objects (e.g., when driving on the road). Using visual detection tasks and multivariate decoding of MEG data, we have related this efficiency to a rapid prioritization of task-relevant object category information in visual cortex. This early attentional enhancement of visual information forms a neural correlate of successful selection behavior in everyday environments.

 

Relevant Publications:

Battistoni, Kaiser, Hickey, Peelen. (2020) Cortex.

Kaiser, Oosterhof, Peelen. (2016) J Neurosci.

Hickey, Kaiser, Peelen. (2015) J Exp Psychol Gen.

Organization of High-Level Visual Cortex



Regions in high-level visual cortex have been associated with  preferential processing of visual category information. It is a debated question whether such visual category representations reflect category-associated visual features (e.g., shape properties that are typical for a specific category), or whether these representations are genuinely categorical, and thus somewhat detached from visual properties. Using fMRI and MEG decoding approaches, we showed that category representations cannot be reduced to visual (shape) similarity and that shape- and category-representations co-exist in high-level visual areas.

Relevant Publications:

Proklova, Kaiser, Peelen. (2019) Neuroimage.

Kaiser*, Azzalini*, Peelen. (2016) J Neurophysiol.

Proklova*, Kaiser*, Peelen. (2016) J Cogn Neurosci.

Person Perception

 

Perceiving the people around us is key for our everyday lives, from recognizing individuals to understanding social interactions. Person perception is mediated by a set of specialized cortical mechanisms. In my research, I try to understand how these mechanisms support the extraction of meaningful person characteristics (e.g., whether we see a man or a woman, or whether we know a specific person or not) from sensory signals, and how this information varies across brain regions and across temporal scales. 

 

Relevant Publications:

Ambrus*, Kaiser*, Cichy, Kovács. (2019) Cerebral Cortex.

Kaiser*, Strnad*, Seidl, Kastner, Peelen. (2014) J Neurophysiol.

Kaiser, Walther, Schweinberger, Kovács. (2013) J Neurophysiol.

Walther, Schweinberger, Kaiser, Kovács. (2013) Cortex.

Kovács, Kaiser, Kaliukhovich, Vidnyánszky, Vogels. (2013) J Neurosci.

Real-world structure and efficient natural perception


Visual information in real-world environments is structured. For example, the objects around us do not appear in random positions in space, but adhere to recurring regularity structures, which depend on physical constraints, an object’s functional properties, and by typical relationships between multiple objects. Using a combination of M/EEG recordings, functional MRI, the project aims to achieve a better understanding of how such regularity structures shape object and scene processing in the visual system. 

Relevant Publications:

Kaiser, Häberle, Cichy. (2020) Hum Brain Mapp.

Kaiser, Turini, Cichy. (2019) eLife.

Kaiser, Quek, Cichy, Peelen. (2019) Trends Cogn Sci.

Kaiser, Cichy. (2018) Cognition.

Kaiser, Cichy. (2018) J Neurophysiol.

Kaiser, Moeskops, Cichy. (2018) Neuroimage.

Kaiser, Peelen. (2018) Neuroimage.

Kaiser, Haselhuhn. (2017) J Neurosci.

Stein, Kaiser, Peelen. (2015) J Vis.

Kaiser, Stein, Peelen. (2015) Psychon Bull Rev.

Kaiser, Stein, Peelen. (2014) Proc Natl Acad Sci USA.