Neuroscience 2004 Abstract
| Presentation Number: | 433.21 |
|---|---|
| Abstract Title: | Computer program to test hypothesis that working memory chunks register neurally as EEG harmonics within an “octave” band. |
| Authors: |
Glassman, R. B.*1
1Dept Psychol, Lake Forest Col, Lake Forest, IL |
| Primary Theme and Topics |
Cognition and Behavior - Human and Animal Cognition and Behavior -- Cognitive learning and memory systems |
| Secondary Theme and Topics | Techniques in Neuroscience<br />- Data analysis, physiological methods, statistics |
| Session: |
433. Working Memory III Poster |
| Presentation Time: | Monday, October 25, 2004 8:00 AM-9:00 AM |
| Location: | San Diego Convention Center - Hall A-H, Board # KK23 |
| Keywords: | computer, EEG, synchrony, working memory |
The widely-considered hypothesis of attribute-binding by brain wave coherence may be extended to consideration of the small numbers of items that fill each moment’s working memory (WM) capacity: Perhaps each of up to 3 or 4 WM items is marked by a different EEG frequency. According to my hypothesis, prevention of difference-rhythm “aliases” suggests all such frequencies occur within an “octave” band, in which the upper bound is twice the lower (see my SfN abstracts, 1994-2003, and articles in Brain Res. Bull., 1999, 2003; Prog. Neuro-Psychopharmacol. & Biol. Psychiat., 2000; and Chapter 10 of Time and Mind II - H. Helfrich, ed., Hogrefe & Huber, 2003). Elsewhere, I present the programs for EEG and WM-behavior data acquisition, and an EEG amplifier schematic using a quad op-amp chip (Note: Electrical safety requires care). Here, I give source code written in G, an iconic language (LabVIEW; National Instruments, Austin TX), intended for off-line analysis of waveforms recorded to a file. The program uses built-in FFT and waveform peak-detection functions of the software. The analysis epoch should be made adjustable, to encompass spans of 0.2 to 5 sec, meaningful for exploring WM properties. The program selects the highest-amplitude four peaks, finding all C(4,2)=6 quotients among these four frequencies, taken two at a time. Each of these peak-ratios is compared to seven standard harmony ratios (3/2, 4/3, etc.), associating it with the ideal ratio to which it is closest. A statistical measure of the distance between each observed ratio and its closest ideal ratio is calculated and plotted. It should be noted that the expected values of these distances are different for different harmonies; another statistical issue to be resolved concerns the post hoc aspect of the comparison of peak frequencies with ideal harmony ratios. Please offer suggestions (glassman@lfc.edu).
Supported by Lake Forest College sabbatical leave 2003-4
Sample Citation:
[Authors]. [Abstract Title]. Program No. XXX.XX. 2004 Neuroscience Meeting Planner. San Diego, CA: Society for Neuroscience, 2004. Online.
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