You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: default_amp_ticks.m
    path of file: ./repos/erplab/functions
    
    the code of the file until where you have to start completion: % PURPOSE: subroutine for ploterpGUI.m
%          Creates default Y ticks for ERPLAB's plotting GUI
%
% FORMAT
%
%  [def miny maxy] = default_amp_ti
    
function is part of ERPLAB Toolbox ***
% Author: Javier Lopez-Calderon & Steven Luck
% Center for Mind and Brain
% University of California, Davis,
% Davis, CA
% 2012
%
% Rewritten by JLC. Nov 10th, 2013
%
function [def, miny, maxy] = default_amp_ticks(ERP, binArray, yrange)
def   = {'-1 1'};
if nargin<3
        yrange = [];
end