Comparative judgments with missing information: A regression and process tracing analysis

Christof Körner; Heiner Gertzen; Clemens Bettinger; Dietrich Albert

doi:10.1016/j.actpsy.2006.06.005

Comparative judgments with missing information: A regression and process tracing analysis

Acta Psychologica ◽

10.1016/j.actpsy.2006.06.005 ◽

2007 ◽

Vol 125 (1) ◽

pp. 66-84 ◽

Cited By ~ 1

Author(s):

Christof Körner ◽

Heiner Gertzen ◽

Clemens Bettinger ◽

Dietrich Albert

Keyword(s):

Process Tracing ◽

Missing Information

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Out of sight – out of mind? Information acquisition patterns in risky choice framing

Polish Psychological Bulletin ◽

10.2478/ppb-2014-0004 ◽

2014 ◽

Vol 45 (1) ◽

pp. 21-28 ◽

Cited By ~ 2

Author(s):

Michael Schulte-Mecklenbeck ◽

Anton Kühberger

Keyword(s):

Information Acquisition ◽

Risky Choice ◽

Critical Discussion ◽

Process Tracing ◽

Redundant Information ◽

Missing Information ◽

Choice Framing ◽

Risky Option ◽

Process Level ◽

Choice Level

Abstract We investigate whether risky choice framing, i.e., the preference of a sure over an equivalent risky option when choosing among gains, and the reverse when choosing among losses, depends on redundancy and density of information available in a task. Redundancy, the saliency of missing information, and density, the description of options in one or multiple chunks, was manipulated in a matrix setup presented in MouselabWeb. On the choice level we found a framing effect only in setups with non-redundant information. On the process level outcomes attracted more acquisitions than probabilities, irrespective of redundancy. A dissociation between acquisition behavior and choice calls for a critical discussion of the limits of process-tracing measures for understanding and predicting choices in decision making tasks

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On the Use of POCS for Restoring the “Missing Wedge” in Electron Tomography

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010018135x ◽

1990 ◽

Vol 48 (1) ◽

pp. 520-521

Author(s):

Neng-Yu Zhang ◽

Bruce F. McEwen ◽

Joachim Frank

Keyword(s):

Function Space ◽

Convex Sets ◽

Electron Tomography ◽

Spinal Ganglion ◽

Fourier Space ◽

Missing Information ◽

Voltage Electron ◽

High Voltage Electron Microscope ◽

Energy Bound ◽

Spatial Boundedness

Reconstructions of asymmetric objects computed by electron tomography are distorted due to the absence of information, usually in an angular range from 60 to 90°, which produces a “missing wedge” in Fourier space. These distortions often interfere with the interpretation of results and thus limit biological ultrastructural information which can be obtained. We have attempted to use the Method of Projections Onto Convex Sets (POCS) for restoring the missing information. In POCS, use is made of the fact that known constraints such as positivity, spatial boundedness or an upper energy bound define convex sets in function space. Enforcement of such constraints takes place by iterating a sequence of function-space projections, starting from the original reconstruction, onto the convex sets, until a function in the intersection of all sets is found. First applications of this technique in the field of electron microscopy have been promising.To test POCS on experimental data, we have artificially reduced the range of an existing projection set of a selectively stained Golgi apparatus from ±60° to ±50°, and computed the reconstruction from the reduced set (51 projections). The specimen was prepared from a bull frog spinal ganglion as described by Lindsey and Ellisman and imaged in the high-voltage electron microscope.

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