Christensen JH., Lengyel M. & Fiser J. (2014) The temporal balance between evidence integration and probabilistic sampling in perceptual decision making. VSS 2014, Journal of Vision 14 (10), 836-836 [Abstract]
Models of evidence integration (EI) assume that the accumulation of external information alone is the dominant process during perceptual decision making until an overt response is made. In contrast, probabilistic sampling (PS) theories of the representation of uncertainty (Fiser at al. 2010) posit that time during perceptual decision making is primarily used for collecting samples […]
Karuza EA., Emberson LL., Roser ME., Gazzaniga MS., Cole D., Aslin RN. & Fiser J. (2014) Dynamic shifts in connectivity between frontal, occipital, hippocampal and striatal regions characterize statistical learning of spatial patterns. VSS 2014, Journal of Vision 14 (10), 955-955 [Abstract]
Extensive behavioral evidence has revealed that humans automatically develop internal representations that are adapted to the temporal and spatial statistics of the environment. However, the neural systems underlying this statistical learning process are not fully understood. Recently, various neuroimaging methods have been employed to examine this topic, but these studies have focused exclusively on temporally […]
Arató J. & Fiser J. (2014) Learning about the Structure of Probabilistic Visual Events. BCCCD 2014, Budapest, Hungary [Abstract]
There is increasing evidence suggesting, that people encode dynamic visual information probabilistically. However, the mechanism of this phenomena is unknown. Recently Kidd et al (2012) investigated, how predictability of varying visual stimuli influences attention and learning in infants. Their main finding was, that infants maintain attention longest for stimuli, that have intermediate predictability. Such a […]
Jellinek S. & Fiser J. (2014) Neural correlates of learning and uncertainty during the acquisition of novel categories. BCCCD 2014, Budapest, Hungary [Abstract]
In our study, we addressed the question of whether and how the learning process of a novel category and uncertainty in our knowledge about it is reflected in ERP responses and alpha-band suppression of the brain. To test these ideas, we built our experimental procedure on the oddball paradigm that is frequently used to investigate […]
Haefner RM. & Fiser J. (2014) Good noise or bad noise? The role of correlated variability in a probabilistic inference framework. COSYNE 2014, Salt Lake City, UT [Abstract]
The responses of sensory neurons in cortex are variable, and this variability is often correlated [Cohen and Kohn, 2011]. While correlations were initially seen as primarily detrimental to the ability of neuronal populations to carry information about an external stimulus [Zohary et al., 1994], more recent studies have shown that they need not be information-limiting […]
Fiser J. & White BL. (2014) Learning-based cross-modal suppression of ongoing activity in primary cortical areas of the awake rat. COSYNE 2014, Salt Lake City, UT [Abstract]
Ongoing activity is ubiquitous in the cortex and recently has been implied to play a significant functional role in shaping sensory-evoked responses by reflecting the momentary internal state of the brain together with its knowledge about the external world (Berkes et al., Science 2011). A wide variety of studies also reported that ongoing neural signal […]
Fiser J. (2015) Factors that influence judging and guessing about probabilistic event sequences. SFX 2015, Pisa, Italy [Abstract]
Previous studies have reported several factors, including prior knowledge, past experience, immediately preceding events, and rate of event repetitions that influence humans’ ability to predict and perceive sequentially occurring probabilistic events. However, many of these factors are correlated and most earlier studies made little effort to disentangle their confounding effects. I will present a series […]
Christensen JH., Bex PJ. & Fiser J. (2015) Prior implicit knowledge shapes human threshold for orientation noise. VSS 2015, Journal of vision 15 (9), 24-24 [Abstract]
Although orientation coding in the human visual system has been researched with simple stimuli, little is known about how orientation information is represented while viewing complex images. We show that, similar to findings with simple Gabor textures, the visual system involuntarily discounts orientation noise in a wide range of natural images, and that this discounting […]
Fiser J., Koblinger Á. & Arató J. (2015) The interplay between long-and short-term memory traces in sequential visual decision making. SFN 2015, Chicago, IL [Abstract]
Past experience strongly guides sensory processing and influences every perceptual decision. Yet, due to contradictory findings in the literature, the exact pattern of these effects is unclear and a convincing general computational framework underlying these effects is still missing. Even in the simplest version of the problem, making a forced choice between two hypotheses based […]
Arato J., Khani A., Rainer G. & Fiser J. (2015) Statistical determinants of sequential visual decision-making. ECVP 2015, Perception 44, 369-369 [Abstract]
Apart from the raw visual input, people’s perception of temporally varying ambiguous visual stimuli is strongly influenced by earlier and recent summary statistics of the sequence, by its repetition/alternation structures, and by the subject’s earlier decisions and internal biases. Surprisingly, neither a thorough exploration of these effects nor a framework relating those effects exist in […]