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 reference:ft_datatype_source [2018/08/23 14:43] reference:ft_datatype_source [2018/08/23 14:43] (current) Line 1: Line 1: + =====  FT_DATATYPE_SOURCE ===== + + Note that this reference documentation is identical to the help that is displayed in MATLAB when you type "help ft_datatype_source"​. + + <​html><​pre>​ + <​font color=green>​FT_DATATYPE_SOURCE​ describes the FieldTrip MATLAB structure for data that is + represented at the source level. This is typically obtained with a beamformer of + minimum-norm source reconstruction using <​font color=green>​FT_SOURCEANALYSIS​. + + An example of a source structure obtained after performing DICS (a frequency + domain beamformer scanning method) is shown here + + pos: [6732x3 double] ​      ​positions at which the source activity could have been estimated + ​inside:​ [6732x1 logical] ​     boolean vector that indicates at which positions the source activity was estimated + dim: [xdim ydim zdim]      if the positions can be described as a 3D regular grid, this contains the + dimensionality of the 3D volume + cumtapcnt: [120x1 double] ​       information about the number of tapers per original trial + time: 0.100                 the latency at which the activity is estimated (in seconds) + freq: 30                    the frequency at which the activity is estimated (in Hz) + pow: [6732x120 double] ​    the estimated power at each source position + powdimord: '​pos_rpt' ​            ​defines how the numeric data has to be interpreted,​ + in this case 6732 dipole positions x 120 repetitions (i.e. trials) + cfg: [1x1 struct] ​         the configuration used by the function that generated this data structure + + Required fields: + - pos + + Optional fields: + - time, freq, pow, coh, eta, mom, ori, cumtapcnt, dim, transform, inside, cfg, dimord, other fields with a dimord + + Deprecated fields: + - method, outside + + Obsoleted fields: + - xgrid, ygrid, zgrid, transform, latency, frequency + + Revision history: + + (2014) The subfields in the avg and trial fields are now present in the + main structure, e.g. source.avg.pow is now source.pow. Furthermore,​ the + inside is always represented as logical vector. + + (2011) The source representation should always be irregular, i.e. not + a 3-D volume, contain a "​pos"​ field and not contain a "​transform"​. + + (2010) The source structure should contain a general "​dimord"​ or specific + dimords for each of the fields. The source reconstruction in the avg and + trial substructures has been moved to the toplevel. + + (2007) The xgrid/​ygrid/​zgrid fields have been removed, because they are + redundant. + + (2003) The initial version was defined + + See also <​font color=green>​FT_DATATYPE,​ <​font color=green>​FT_DATATYPE_COMP,​ <​font color=green>​FT_DATATYPE_DIP,​ <​font color=green>​FT_DATATYPE_FREQ,​ + <​font color=green>​FT_DATATYPE_MVAR,​ <​font color=green>​FT_DATATYPE_RAW,​ <​font color=green>​FT_DATATYPE_SOURCE,​ <​font color=green>​FT_DATATYPE_SPIKE,​ + <​font color=green>​FT_DATATYPE_TIMELOCK,​ <​font color=green>​FT_DATATYPE_VOLUME​ +