Dear all
  I am a new learner of CONN software. First I downloaded the NYU_TRT data and studied the example of conn_batchexample_nyu.m. When I evaluated the part of PREPROCESSING step :

%% PREPROCESSING step (using default values for most parameters, see help conn_batch to define non-default values)
% CONN New experiment (realignment/coregistration/segmentation/normalization/smoothing)
clear batch;
batch.filename=fullfile(cwd,'conn_NYU.mat'); % New conn_*.mat experiment name
batch.New.steps='default_mni'; %{'structural_segment&normalize','functional_realign','functional_slicetime','functional_art','functional_normalize','functional_smooth'};
batch.New.sliceorder='interleaved (Siemens)';
batch.New.functionals=repmat({{}},[NSUBJECTS,1]); % Point to functional volumes for each subject/session
for nsub=1:NSUBJECTS
for nses=1:nsessions
batch.New.functionals{nsub}{nses}{1}=FUNCTIONAL_FILE{nsub,nses}
end
end %note: each subject's data is defined by three sessions and one single (4d) file per session
batch.New.structurals=STRUCTURAL_FILE; % Point to anatomical volumes for each subject
conn_batch(batch);
% note: stop after this step if you wish to review the preprocessing
% results before continuing

it report the following error:

 Undefined function or variable 'art_threshold'.

Error in conn_setup_preproc (line 287)
if numel(art_threshold)>2, art_use_diff_global=art_thresholds(3); end
Error in conn_setup_wizard (line 139)
conn_setup_preproc(OPTIONS.STEPS,'multiplesteps',1,'dogui',OPTIONS.CONN_DISPLAY,'structural_template',OPTIONS.STRUCTURAL_TEMPLATE,'functional_template',OPTIONS.FUNCTIONAL_TEMPLATE,...
Error in conn_batch (line 232)
conn_setup_wizard(OPTIONS);

what is the meaning of art_threshold? And how to define it?
Thank you