I want to vertically center the text Rule boolean behavior in each row, how can I do this?

\documentclass{article}
\usepackage{graphicx}
\graphicspath{ {images/} }
\usepackage[rightcaption]{sidecap}
\usepackage{wrapfig}
\begin{document}
\begin{table}
\centering
\begin{tabular}{|c|c|c|c|}
\hline
Rule & Sample Evolution & Boolean Form & Behavior\\
\hline
$Rule$ & \includegraphics{stable.png} &$boolean$ & behavior\\
\hline
$Rule$ & \includegraphics{decreasing.png} &$boolean$ & behavior\\
\hline
$Rule$ & \includegraphics{growing.png} & $ boolean $ & behavior\\
\hline
$Rule$ & \includegraphics{chaotic.png} &$ boolean $ & behavior\\
\hline
\end{tabular}
\caption{Lorem ipsum}
\end{table}
\end{document}

$Rule$the font is designed to make adjacent letters look like distinct variables and not like a word. Use\textit{Rule}, and\textit{Boolean}– David Carlisle Nov 30 '14 at 21:09