Archive for the ‘Publications’ Category

Spatiotemporal Symmetry and Multifractal Structure of Head Movements

Wednesday, July 1st, 2009

Ashenfelter, K. T., Boker, S. M., Waddell, J. R., & Vitanov, N. (in press). Spatiotemporal Symmetry and Multifractal Structure of Head Movements during Dyadic Conversation. Journal of Experimental Psychology: Human Perception & Performance

This study examined the influence of sex, social dominance, and context on motion-tracked head movements during dyadic conversations. Windowed cross-correlation analyses found high peak correlation between conversants’ head movements over short (2 second) intervals and a high degree of nonstationarity. Nonstationarity in head movements was found to be related to gender of the participants. Multifractal analysis found small-scale fluctuations to be persistent, and large-scale fluctuations to be antipersistent. These results are consistent with a view that symmetry is formed between conversants over short intervals and that this symmetry is broken at longer, irregular intervals.

(a) Coordination between dancers is mostly stationary (b) Coordination during conversation is highly nonstationary.

The manuscript of this article accepted for publication can be downloaded as a PDF. This article may not exactly replicate the final version published in the APA journal. It is not the copy of record.

Describing Intraindividual Variability at Multiple Time Scales Using Derivative Estimates

Wednesday, July 1st, 2009

Deboeck, P. R., Montpetit, M. A., Bergeman, C. S. & Boker, S. M. (in press). Describing Intraindividual Variability at Multiple Time Scales Using Derivative Estimates. Psychological Methods.

Studying intraindividual variability can be made more productive by examining variability of interest at specific time scales, rather than considering the variability of entire time series. Examination of variance in observed scores may not be sufficient, as these neglect the time scale dependent relationships between observations. This article outlines a method to examine intraindividual variability through estimates of the variance and other distributional properties at multiple time scales using estimated derivatives.

The manuscript of this article accepted for publication can be downloaded as a PDF. This article may not exactly replicate the final version published in the APA journal. It is not the copy of record.

Mapping and Manipulating Facial Expression

Wednesday, July 1st, 2009

Theobald, B., Matthews, I., Mangini, M., Spies, J., Brick, T., Cohn, J. F., & Boker, S. (2009) Mapping and Manipulating Visual Prosody. Language and Speech 52:2, 369-386.

This article, just published in Language and Speech, describes the process by which we are mapping facial expressions from one individual to another in real time.

The manuscript as it was submitted can be downloaded as a PDF

Something in the Way We Move - JEP:HPP 2009 Article

Thursday, May 21st, 2009

Boker, S. M., Cohn, J. F., Theobald, B., Matthews, I., Mangini, M., Spies, J. R., Ambadar, Z., & Brick, T. R.  (In press). Something in the Way We Move: Motion Dynamics, not Perceived Sex, Influence Head Movements in Conversation. Journal of Experimental Psychology: Human Perception and Performance.

The manuscript of this article accepted for publication can be downloaded as a PDF This article may not exactly replicate the final version published in the APA journal. It is not the copy of record.

WIAMIS 2009

Friday, May 15th, 2009

The WIAMIS 2009 paper:

Brick, T. R., Spies, J. R., Theobald, B-J., Matthews, I., and Boker, S. M. (2009). High-Presence, Low-Bandwidth, Apparent 3D Video-Conferencing With a Single Camera. In Proceedings of the 10th Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS 2009).

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