Recent Submissions

  • Bioplausible multiscale filtering in retinal to cortical processing as a model of computer vision 

    Nematzadeh, Nasim; Lewis, Trent Wilson; Powers, David Martin (SCITEPRESS, 2015-01)
    Visual illusions emerge as an attractive field of research with the discovery over the last century of a variety of deep and mysterious mechanisms of visual information processing in the human visual system. Among many ...
  • Multiplying the Mileage of Your Dataset with Subwindowing 

    Atyabi, Adham; Fitzgibbon, Sean Patrick; Powers, David Martin (Springer Berlin Heidelberg, 2011)
    This study is focused on improving the classification performance of EEG data through the use of some data restructuring methods. In this study, the impact of having more training instances/samples vs. using shorter window ...
  • Towards a brain-controlled Wheelchair Prototype 

    Yazdani, Naisan; Khazab, Fatemah; Fitzgibbon, Sean Patrick; Luerssen, Martin Holger; Powers, David Martin; Clark, Christopher Richard (BCS, 2010)
    In this project, a design for a non-invasive, EEG-based braincontrolled wheelchair has been developed for use by completely paralyzed patients. The proposed design includes a novel approach for selecting optimal electrode ...
  • Multiplication of EEG Samples through Replicating, Biasing, and Overlapping 

    Atyabi, Adham; Fitzgibbon, Sean Patrick; Powers, David Martin (Springer Berlin Heidelberg, 2012)
    EEG recording is a time consuming operation during which the subject is expected to stay still for a long time performing tasks. It is reasonable to expect some uctuation in the level of focus toward the performed task ...
  • A computationally and cognitively plausible model of supervised and unsupervised learning 

    Powers, David Martin (Springer-Verlag, 2013-01-01)
    The issue of chance correction has been discussed for many decades in the context of statistics, psychology and machine learning, with multiple measures being shown to have desirable properties, including various definitions ...
  • PSO-based dimension reduction of EEG recordings: Implications for subject transfer in BCI 

    Atyabi, Adham; Luerssen, Martin Holger; Powers, David Martin (Elsevier, 2013-11)
  • Surface Laplacian of Central Scalp Electrical Signals is Insensitive to Muscle Contamination 

    Fitzgibbon, Sean Patrick; Lewis, Trent Wilson; Powers, David Martin; Whitham, Emma Mary; Willoughby, John Osborne; Pope, Kennith (IEEE - Institute of Electrical and Electronics, 2013-01)
    Abstract—Objective: To investigate the effects of surface Laplacian processing on gross and persistent electromyographic (EMG) contamination of electroencephalographic (EEG) signals in electrical scalp recordings. Methods: ...
  • Evaluation: from Precision, Recall and F-measure to ROC, Informedness, Markedness and Correlation 

    Powers, David Martin (Bioinfo Publications, 2011-12-15)
    Commonly used evaluation measures including Recall, Precision, F-Measure and Rand Accuracy are biased and should not be used without clear understanding of the biases, and corresponding identification of chance or base ...
  • Evaluation Evaluation: a Monte Carlo study 

    Powers, David Martin (IOS Press, 2008-07)
    Over the last decade there has been increasing concern about the biases embodied in traditional evaluation methods for Natural Language Processing/Learning, particularly methods borrowed from Information Retrieval. Without ...
  • Adabook and Multibook: adaptive boosting with chance correction 

    Powers, David Martin (2013-09)
    There has been considerable interest in boosting and bagging, including the combination of the adaptive techniques of AdaBoost with the random selection with replacement techniques of Bagging. At the same time there has ...
  • The problem with Kappa 

    Powers, David Martin (Association for Computational Linguistics, 2012-04)
    It is becoming clear that traditional evaluation measures used in Computational Linguistics (including Error Rates, Accuracy, Recall, Precision and F-measure) are of limited value for unbiased evaluation of systems, and ...
  • Recall & Precision versus The Bookmaker 

    Powers, David Martin (International Conference on Cognitive Science, 2003-07-13)
    In the evaluation of models, theories, information retrieval systems, learning systems and neural networks we must deal with the ubiquitous contingency matrix of decisions versus events. In general this is manifested as ...
  • Verb similarity on the taxonomy of WordNet 

    Yang, Dongqiang; Powers, David Martin (Masaryk University, 2006)