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Erschienen in:
Quantum-Source Independent Component Analysis and Related Statistical Blind Qubit Uncoupling Methods Kapitel lesen Erstes Kapitel lesen

2014 | OriginalPaper | Buchkapitel

16. Exploratory Analysis of Brain with ICA

verfasst von : Rubén Martín-Clemente

Erschienen in: Blind Source Separation

Verlag: Springer Berlin Heidelberg

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Abstract

This chapter introduces the use of independent component analysis (ICA) in the study of electroencephalographic (EEG) data. Though the main application of ICA is in the context of denoising, we prefer to focus our attention to the independent components of artifacts-free EEG data. The interpretation of these independent components is still controversial, and we outline the more accepted alternatives. An introduction to the results obtained when applying ICA to evoked potentials (EPs) and event-related potentials (ERPs) is presented, as well as an explanation of the ICA of natural images and its relationship with models of visual cortex is also presented. This chapter is written as a general introduction to the subject for those who want to get started in the main topics.

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Vorheriges Kapitel Nonnegative Matrix Factorization Sparse Coding Strategy for Cochlear Implants
Nächstes Kapitel Supervised Normalization of Large-Scale Omic Datasets Using Blind Source Separation
Fußnoten
1
The hippocampus plays an important role in the formation of new memories, and in spatial orientation. It also seems to be related to behavioral inhibition.
 
2
The hypothalamus is involved in emotion and endocrine function control, hunger, and sleep–wake cycle regulation, among other tasks. It also controls the pituitary gland.
 
3
The amygdala is involved in memory, emotion, and fear.
 
4
The thalamus regulates auditory, somatosensory, and visual sensory information. All sensory stimuli, with the exception of smell, is received in the cortex after passing through the thalamus.
 
5
See Sect. 16.2.3.
 
6
P300 (also called P3 or late positive component or LPC) is a reliable positive ERP that peaks at approximately 300 ms after the presentation of relevant or infrequent stimuli. It has two subcomponents, P3a and P3b, which respectively originate from frontal and parietal lobes. P3a is associated with the response to a change in the environment, while the amplitude of P3b is inversely proportional to the probability of the stimulus. P300 also seems to be correlated with decision-making processes.
 
7
The term “grand average” means that the author averaged together epochs from many subjects.
 
8
N1 is a large EP that appears in visual discrimination tasks.
 
9
HOS = Higher Order Statistics. SOS = Second-Order Statistics.
 
10
The number of epochs ranged from 300 to 700.
 
11
Given the ICA model \(\mathbf{x} = \mathbf{A}\,\mathbf{s}\), where \(\mathbf{x}\) stands for the observations and \(\mathbf{s}\) represents the independent components, we project back to the scalp these independent components simply by setting the other independent components to zero. In other words, the observations are reconstructed considering only the contribution of the independent components time-locked to the visual stimuli.
 
12
P1 (or P100) is an EP sensitive to visual discrimination tasks that peaks at 100–130 ms after stimulus presentation and is modulated by attention.
 
13
Each cell in the visual cortex responds only to the presence of light in a well-defined part of the retina, called the receptive field of the cell. The part of the visual scene projected on that area of the retina is also called “receptive field”. Roughly speaking, we may think that the job of the cell is to report to the rest of the brain what is happening in that little area.
 
14
The pixels of each pack are stacked one under the other to form the associated \(\textit{MN} \times 1\) observation vector.
 
15
Actually, this statement has to be taken with care: all basis functions (more or less) equally contribute to many image patches.
 
16
Interestingly, in the original formulation of the algorithm [58], \(g(\mathbf{w})\) is defined as \(g(\mathbf{w}) = E[r(t)\,y(t)] - \epsilon \).
 
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Metadaten
Titel
Exploratory Analysis of Brain with ICA
verfasst von
Rubén Martín-Clemente
Copyright-Jahr
2014
Verlag
Springer Berlin Heidelberg
Buch
Blind Source Separation

Print ISBN: 978-3-642-55015-7

Electronic ISBN: 978-3-642-55016-4

Copyright-Jahr: 2014

DOI
https://doi.org/10.1007/978-3-642-55016-4_16

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