spharapy.datasets: Sample data sets

The spharapy.datasets: module includes utilities to provide sample datasets.

spharapy.datasets.load_eeg_256_channel_study()

Load sensor setup and measured EEG data

The data set consists of a triangulation of a 256 channel equidistant EEG cap and EEG data from previously performed experiment addressing the cortical activation related to somatosensory-evoked potentials (SEP). During the experiment the median nerve of the right forearm was stimulated by bipolar electrodes (stimulation rate: 3.7 Hz, interstimulus interval: 270 ms, stimulation strength: motor plus sensor threshold [Mauguiere et al., 1999, Cruccu et al., 2008], constant current rectangular pulse wave impulses with a length of 50 mu s, number of stimulations: 6000). Data were sampled at 2048 Hz and software high-pass (24 dB/oct, cutoff-frequency 2 Hz) and notch (50 Hz and two harmonics) filtered. All trials were manually checked for artifacts, the remaining trials were averaged, see also S1 data set in [Graichen et al., 2015].

Number of vertices	256
Number of triangles	480
SEP Data (EEG)	256 channels, 369 time samples
Time range	50 ms before to 130 ms after stimulation
Sampling frequency	2048 Hz

Parameters:

None

Returns:

triangulation and EEG data – Dictionary-like object containing the triangulation of a simple triangular mesh. The attributes are: vertlist, the list of vertices, trilist, the list of triangles, labellist the list of labels of the EEG channels, eegdata, an array containing the EEG data.

Return type:

dictionary

spharapy.datasets.load_minimal_triangular_mesh()

Returns the triangulation of a single triangle

The data set consists of a list of three vertices at the unit vectors of vector space \(\mathbb{R}^3\) and a list of a single triangle.

Number of vertices	3
Number of triangles	1

Parameters:

None

Returns:

triangulation – Dictionary-like object containing the triangulation of a single triangle. The attributes are: vertlist, the list of vertices, trilist, the list of triangles.

Return type:

dictionary

spharapy.datasets.load_simple_triangular_mesh()

Returns the triangulation of a simple triangular mesh

The data set consists of a triangulation of an unit hemisphere.

Number of vertices	131
Number of triangles	232

Parameters:

None

Returns:

triangulation – Dictionary-like object containing the triangulation of a simple triangular mesh. The attributes are: vertlist, the list of vertices, trilist, the list of triangles.

Return type:

dictionary