EEGlocations: EEGlocations

In gjmvanboxtel/eegr: Electrophysiological data analysis

EEGlocations

Description

Data frame of class sensorlocs containing 346 sensor locations corresponding to the 10-5 electrode system for EEG.

Data frame of class sensorlocs containing 346 sensor locations corresponding to the 10-5 electrode system for EEG.

Usage

EEGlocations

EEGlocations

Format

A data frame with 356 rows and 8 columns:

label

(factor) electrode label according to the 10-5 system, e.g., "AF1", "P3", etc.

x

(numeric) Cartesian x-axis (left-to-right) value

y

(numeric) Cartesian y-axis (back-to-front) value

z

(numeric) Cartesian z-axis (bottom-to-top) value

x2d

(numeric) x-axis value of orthogonal projection onto 2D plane

y2d

(numeric) y-axis value of orthogonal projection onto 2D plane

theta

(numeric) angle between 3D z-axis and x/y plane

phi

(numeric) angle between x- and y-axes

A data frame with 356 rows and 8 columns:

label

(factor) electrode label according to the 10-5 system, e.g., "AF1", "P3", etc.

x

(numeric) Cartesian x-axis (left-to-right) value

y

(numeric) Cartesian y-axis (back-to-front) value

z

(numeric) Cartesian z-axis (bottom-to-top) value

x2d

(numeric) x-axis value of orthogonal projection onto 2D plane

y2d

(numeric) y-axis value of orthogonal projection onto 2D plane

theta

(numeric) angle between 3D z-axis and x/y plane

phi

(numeric) angle between x- and y-axes

Details

A sensorlocs object is a data.frame containing sensor locations that can be used in further analyses or display. In order to match R's plotting functions, the coordinate system used in eegr models the head as a perfect sphere with a radius of 1 and the origin in the middle of the head (0,0,0).

Within this system, Cartesian coordinates are defined along the following axes:

x

the X-axis points from the left (-) to right (+) pre-auricular points, i.e., positive values of x refer to sensors over the right hemisphere, whereas negative values of x refer to sensors over the left hemisphere.

y

the Y-axis points from the back of the head (inion, -) to the front (nasion, +), i.e., positive values of y refer to sensors over the anterior part of the brain, whereas negative values of y refer to sensors over the posterior part of the brain.

z

the Z-axis point from the bottom of the head (-) to the top (+) of body, i.e., positive values of z refer to sensors above the center of the head, whereas negative values of z refer to sensors below the center of the head.

Angular coordinates are defined as follows:

theta

Theta is the angle angle between the Z-axis and the X/Y-plane; positive values indicate sensors over the right hemisphere; negative values over the left.

phi

Phi is the angle between the X- and Y-axes, with positive values indicating counterclockwise rotation and negative values clockwise.

A sensorlocs object is a data.frame containing sensor locations that can be used in further analyses or display. In order to match R's plotting functions, the coordinate system used in eegr models the head as a perfect sphere with a radius of 1 and the origin in the middle of the head (0,0,0).

Within this system, Cartesian coordinates are defined along the following axes:

x

the X-axis points from the left (-) to right (+) pre-auricular points, i.e., positive values of x refer to sensors over the right hemisphere, whereas negative values of x refer to sensors over the left hemisphere.

y

the Y-axis points from the back of the head (inion, -) to the front (nasion, +), i.e., positive values of y refer to sensors over the anterior part of the brain, whereas negative values of y refer to sensors over the posterior part of the brain.

z

the Z-axis point from the bottom of the head (-) to the top (+) of body, i.e., positive values of z refer to sensors above the center of the head, whereas negative values of z refer to sensors below the center of the head.

Angular coordinates are defined as follows:

theta

Theta is the angle angle between the Z-axis and the X/Y-plane; positive values indicate sensors over the right hemisphere; negative values over the left.

phi

Phi is the angle between the X- and Y-axes, with positive values indicating counterclockwise rotation and negative values clockwise.

Author(s)

Geert van Boxtel, [e-mail]

Geert van Boxtel <[e-mail]>

References

Oostenveld, R., Praamstra, P., 2001. The five percent electrode system for high-resolution EEG and ERP measurements. Clin. Neurophysiol. 112, 713-719.

Oostenveld, R., Praamstra, P., 2001. The five percent electrode system for high-resolution EEG and ERP measurements. Clin. Neurophysiol. 112, 713-719.

Examples

data(EEGlocations)

data(EEGlocations)

gjmvanboxtel/eegr documentation built on May 20, 2023, 4:26 a.m.