Endel Põder's web page
- pattern recognition
My research interests
I am trying to understand how vision works.
I think that detection and recognition of patterns are the most essential in vision.
Thus, I am interested in almost everything from simple feature detectors to mechanisms behind recognition and categorization of objects and scenes.
There is much more information in the visible world than we ever are able or need to use.
An important function of any visual system is to select the important and ignore irrelevant aspects of the visual world.
The mechanisms that mediate the selection are named “attention”.
Actually, almost all my studies are in some way related to attention.
Another frequent keyword is “crowding” - deterioration of perception when several objects are located close to each other,
usually in peripheral vision.
My usual methods are psychophysical experiments and mathematical or computational modeling.
But I believe that neurobiological studies are at least equally important.
When could we say that we have understood vision?
I have suggested that when we can (at least in principle) build a machine or write a computer program
that could orient in the visual world as effectively as humans, monkeys and other living creatures.
There is not much remained to be done, however, because some neural network algorithms are quite close
to the human performance in object recognition already.
- Põder, E. (2014). Crowding by a single bar: Probing pattern recognition mechanisms in the visual periphery. Journal of Vision, 14(13): 5, 1-12. Article
- Põder E (2014). The changing picture of object substitution masking: Reply to Di Lollo (2014). Front. Psychol. 5:1004. doi: 10.3389/fpsyg.2014.01004 Article
- Põder, E. (2013). Attentional gating models of object substitution masking. Journal of Experimental Psychology: General, 142(4), 1130-1141. Article Manuscript
- Põder, E. (2012). On the rules of integration of crowded orientation signals. i-Perception, 3, 440–454. Article
- Põder, E. (2011). Perception of multi-stable dot lattices in the visual periphery: An effect of internal positional noise. Journal of Vision, 11(2):11, 1–9. Article
- Põder, E. (2008). Crowding with detection and coarse discrimination of simple visual features. Journal of Vision, 8(4):24, 1-6. Article
- Põder, E., & Wagemans, J. (2007). Crowding with conjunctions of simple features. Journal of Vision, 7(2):23, 1-12. Article
- Põder, E. (2007). Effect of colour pop-out on the recognition of letters in crowding conditions. Psychological Research, 71, 641-645.
- Põder, E. (2006). Crowding, feature integration, and two kinds of “attention”. Journal of Vision, 6(2), 163-169. Article
- Põder, E. (2005). Effect of attention on the detection and identification of masked spatial patterns. Perception, 34, 305-318.
- Põder, E. (2004). Effects of set-size and lateral masking in visual search. Spatial Vision, 17, 257-268.
- Bachmann,T., Põder, E., & Luiga, I. (2004). Illusory reversal of temporal order: the bias to report a dimmer stimulus as the first, Vision Research, 44, 241-246.
- Põder, E. (2003). Spatial-frequency spectra of printed characters and human visual perception. Vision Research, 43, 1507-1511.
- Põder, E. (2001). Size-based selection in rapid serial visual presentation. Vision Research 41, 2221-2234.
- Bachmann, T., & Põder, E. (2001). Change in feature space is not necessary for the flash-lag effect. Vision Research 41, 1103-1106.
- Põder, E. (1999). Search for feature and for relative position: Measurement of capacity limitations. Vision Research, 39, 1321-1327.
Conference presentations (not published as articles)
- A Bayesian account of context-induced orientation illusions, ECVP 2012, Alghero. Poster
- Crowding and visual complexity, ECVP 2008, Utrecht. Poster
- Effect of phase on the detection of spatial patterns, VSS 2005, Sarasota, FL. Poster
- Capacity limitations in the perception of letters, ECVP 2004, Budapest. Poster
- Psychophysics of search for multiple targets, ECVP 2003, Paris. Poster
- Capacity limitations in the perception of relative position, ECVP 2001, Kusadasi. Poster
A letter on a curious bias in the measurement of scientific performance
Põder, E. (2010). Let’s correct that small mistake. Journal of the American Society for Information Science & Technology, 61(12), 2593-2594. Article
Calculation of unbiased indicators from ISI Web of Knowledge reports.
Institute of Psychology
University of Tartu
phone: +372 56215437
fax: +372 7376152
Most recent update:
November 6, 2014