%Author's Declaration
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I, SATVIR SINGH, declare that this thesis titled, `INVESTIGATIONS AND RECENT TRENDS IN COGNITIVE SYSTEMS' and the work presented in it are my own. I confirm that:

\begin{itemize}
\item[\tiny{$\blacksquare$}] This work was done wholly or mainly while in candidature for a research degree at this University.

\item[\tiny{$\blacksquare$}] Wherever I have consulted the published work of others, this is always clearly attributed.

\item[\tiny{$\blacksquare$}] Wherever I have quoted from the work of others, the source is always given. With the exception of such quotations, this thesis is entirely my own work.

\item[\tiny{$\blacksquare$}] I have acknowledged all main sources of help.

\item[\tiny{$\blacksquare$}] Wherever the thesis is based on work done by myself jointly with others, I have made clear exactly what was done by others and what I have contributed myself.
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\end{itemize}


Signature: \qquad \qquad \qquad \qquad \qquad \qquad (SATVIR SINGH)\\
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Date:\\
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