TeaP 2012

"The next TeaP will take place in Mannheim, April 1-4 2012. For the first time, the official language of the TeaP will be English, primarily to enable colleagues from other European countries to participate."

http://www.teap.de/index.php/teap2012/mannheim

Fwd: Grouping and Emergent Features in Vision: Toward a Theory of Basic Gestalts

Sorry forgot the reference :)

Pomerantz, J. R., & Portillo, M. C. (2011, July 4). Grouping and Emergent Features in Vision:

Toward a Theory of Basic Gestalts. Journal of Experimental Psychology: Human Perception

and Performance. Advance online publication. doi: 10.1037/a0024330

http://psycnet.apa.org/psycinfo/2011-13455-001/

Begin forwarded message:

From: Krista Overvliet <krista.overvliet@gmail.com>

Date: July 8, 2011 12:53:30 PM GMT+02:00

To: gestalt.revision.general@blogger.com, gestalt.revision.mechanism@blogger.com, gestalt.revision.highlevelvision@blogger.com

Subject: Grouping and Emergent Features in Vision: Toward a Theory of Basic Gestalts

I have the PDF if anyone is interested in reading this paper.

Cheers, Krista

Grouping and Emergent Features in Vision: Toward a Theory of Basic Gestalts

James R. Pomerantz and Mary C. Portillo

Gestalt phenomena are often so powerful that mere demonstrations can confirm their existence, but Gestalts have proven hard to define and measure. Here we outline a theory of basic Gestalts (TBG) that defines Gestalts as emergent features (EFs). The logic relies on discovering wholes that are more discriminable than are the parts from which they are built. These wholes contain EFs that can act as basic features in human vision. As context is added to a visual stimulus, a hierarchy of EFs appears. Starting with a single dot and adding a second yields the first two potential EFs: the proximity (distance) and orientation (angle) between the two dots. A third dot introduces two more potential EFs: symmetry and linearity; a fourth dot produces surroundedness. This hierarchy may extend to collinearity, parallelism, closure, and more. We use the magnitude of Configural Superiority Effects to measure the salience of EFs on a common scale, potentially letting us compare the strengths of various grouping principles. TBG appears promising, with our initial experiments establishing and quantifying at least three basic EFs in human vision.

----
Krista Overvliet, PhD.
 
Laboratory of  Experimental Psychology
University of Leuven
Tiensestraat 102, bus 3711
Room 00.74
3000 Leuven
Belgium
 
phone: +3216326146
skype: kristaovervliet
krista.overvliet@gmail.com
krista.overvliet@psy.kuleuven.be
http://web.me.com/krista.overvliet

----
Krista Overvliet, PhD.
 
Laboratory of  Experimental Psychology
University of Leuven
Tiensestraat 102, bus 3711
Room 00.74
3000 Leuven
Belgium
 
phone: +3216326146
skype: kristaovervliet
krista.overvliet@gmail.com
krista.overvliet@psy.kuleuven.be
http://web.me.com/krista.overvliet

Grouping and Emergent Features in Vision: Toward a Theory of Basic Gestalts

I have the PDF if anyone is interested in reading this paper.

Cheers, Krista

Grouping and Emergent Features in Vision: Toward a Theory of Basic Gestalts

James R. Pomerantz and Mary C. Portillo

Gestalt phenomena are often so powerful that mere demonstrations can confirm their existence, but Gestalts have proven hard to define and measure. Here we outline a theory of basic Gestalts (TBG) that defines Gestalts as emergent features (EFs). The logic relies on discovering wholes that are more discriminable than are the parts from which they are built. These wholes contain EFs that can act as basic features in human vision. As context is added to a visual stimulus, a hierarchy of EFs appears. Starting with a single dot and adding a second yields the first two potential EFs: the proximity (distance) and orientation (angle) between the two dots. A third dot introduces two more potential EFs: symmetry and linearity; a fourth dot produces surroundedness. This hierarchy may extend to collinearity, parallelism, closure, and more. We use the magnitude of Configural Superiority Effects to measure the salience of EFs on a common scale, potentially letting us compare the strengths of various grouping principles. TBG appears promising, with our initial experiments establishing and quantifying at least three basic EFs in human vision.

----
Krista Overvliet, PhD.
 
Laboratory of  Experimental Psychology
University of Leuven
Tiensestraat 102, bus 3711
Room 00.74
3000 Leuven
Belgium
 
phone: +3216326146
skype: kristaovervliet
krista.overvliet@gmail.com
krista.overvliet@psy.kuleuven.be
http://web.me.com/krista.overvliet

ECN: Why would you pay to get published?

http://onlinelibrary.wiley.com/doi/10.1111/j.1460-9568.2011.07752.x/full

Adaptive shape processing in primary visual cortex [Neuroscience]

This is such a beautiful paper! They show how association fields form in V1.

 

 

Aan u verzonden door Jonas via Google Reader:

 

 

Adaptive shape processing in primary visual cortex [Neuroscience]

via PNAS op 14-6-11

The ability to derive meaning from complex sensory input requires the integration of information over space and time, as well as cognitive mechanisms to shape that integration. We studied these processes in the primary visual cortex (V1), where neurons are thought to integrate visual inputs along contours defined by an association field (AF). We recorded extracellularly from single cells in macaque V1 to map the AF, by using an optimization algorithm to find the contours that maximally activated individual cells. We combined the algorithm with a delayed-match-to-sample task, to test how the optimal contours might be molded by the monkey's expectation for particular cue shapes. We found that V1 neurons were selective for complex shapes, a property previously ascribed to higher cortical areas. Furthermore, the shape selectivity was reprogrammed by perceptual task: Over the whole network, the optimal modes of geometric selectivity shifted between distinct subsets of the AF, alternately representing different stimulus features known to predominate in natural scenes. Our results suggest a general model of cortical function, whereby horizontal connections provide a broad domain of potential associations, and top–down inputs dynamically gate these linkages to task switch the function of a network.

 

 

Dingen die u vanaf hier kunt doen:

• Abonneren op PNAS met Google Reader
• Aan de slag met Google Reader om eenvoudig al uw favoriete sites bij te houden

 

 

workshop on Bayesian modeling

http://bayescourse.socsci.uva.nl/

Top-Down Modulation of Human Early Visual Cortex after Stimulus Offset Supports Successful Postcued Report

Top–Down Modulation of Human Early Visual Cortex after Stimulus Offset Supports Successful Postcued Report

Claire Sergent^1,2, Christian C. Ruff^1,3, Antoine Barbot⁴, Jon Driver¹, and Geraint Rees¹

 

http://www.mitpressjournals.org/doi/abs/10.1162/jocn.2010.21553