function[] = import(varargin)
if nargin ==1
    if strcmp(class(varargin{1}, 'PDSession'));
    end
    
    if strcmp(class(varargin{1}, 'PDSubject'));
    end
    
    if strcmp(class(varargin{1}, 'PDExperiment'));
    end
    
    if strcmp(class(varargin{1}, 'string'));
        try
            [base file ext] = fileparts(varargin{1});
            if strcmp(lower(ext), '.edf');
                obj.readEDF(varargin{1});
            end
            
            if strcmp(lower(ext), '.asc');
                obj.readASC(varargin{1});
            end
        end
    end
end
end