18. The even function $f(x)$ defined on $[-2,2]$ is monotonically decreasing on the interval $[0,2]$. If $f(1-m)<f(m)$, find the range of values for $m$.

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18. $f(x)$ is an even function, with $f(-x)=f(x)=f(|x|)$, so regardless of whether $1-m$ and $m$ are positive or negative, we always have
$$
f(1-m)|m|, \\
-2 \leqslant 1-m \leqslant 2, \Rightarrow -1 \leqslant m < \frac{1}{2} . \\
-2 \leqslant m \leqslant 2,
\end{array}\right.
$$