find_sig_onset_offset.m

function [onsets, offsets] = find_sig_onset_offset(sig_sign, specific_sign)

%   find_sig_onset_offset.m finds the onsets and offsets of significant effect windows, in each direction
%   Inputs:
%   sig_sign : 1D array, showing the increase (1), decrease (-1) or no difference, for each time bin
%   specific_sign : a string, 'positive' in the case the function should be looking for significant increase windows, or 'negative' in the case it should be looking 
%   for significant decrease windows
%
%   Outputs:
%   onsets : scalar or 1D array, showing the onset(s) of significant increase or decrease windows (first significant bin in a window, in ms, relative to start of feedback onset). 
%   offsets : scalar or 1D array, showing the offset(s) of significant increase or decrease windows (last significant bin in a window, in ms, relative to start of feedback onset)

if strcmp(specific_sign,'positive')==1
    specific_change_symbol = 1;
elseif strcmp(specific_sign,'negative')==1
    specific_change_symbol = -1;
end

count=1; onsets = [];

for i = 1:(numel(sig_sign)-1)
    if sig_sign(i)==0 & sig_sign(i+1)==specific_change_symbol
        onsets(count) = i+1;
        count=count+1;
    end
end


count=1; offsets = [];

for i = 2:(numel(sig_sign)-1)
    if sig_sign(i)==specific_change_symbol & sig_sign(i+1)==0
        offsets(count) = i;
        count=count+1;
    end
end