The Gaussian MF block behaves as expected mathematically. If the output signal deviates from your expectations, it may be due to incorrect parameters of the Gaussian MF or an issue with the input signal.
%% Plot in MATLAB
t = 0:0.01:10;
sigma = 1; % standard deviation
mean = 5; % peak point at which f(t) = 1
f = exp(-1/2*((t - mean)/sigma).^2);
plot(t, f, 'linewidth', 2), grid on,
ylim([-0.2, 1.2]), xlabel('t'), title('Gaussian membership function')
