  Given a map $f: X\rightarrow Y$ of simply connected spaces of finite type
such. The space of based loops at $f$ of the space of maps between $X$ and $Y$
is denoted by $\Omega_{f} Map(X,Y)$. For $n> 0$, we give a model categorical
interpretation of the existence (in functorial way) of an injective map of
$\mathbb{Q}$-vector spaces $\pi_{n} \Omega_{f}Map(X,Y_{\mathbb{Q}}) \rightarrow
HH^{-n}(C^{\ast}(Y),C^{\ast}(X)_{f})$, where $HH^{\ast}$ is the (negative)
Hochschild cohomology and $C^{\ast}(X)_{f}$ is the rational cochain complex
associated to $X$ equipped with a structure of $C^{\ast}(Y)$-differential
graded bimodule via the induced map of differential graded algebras $f^{\ast}:
C^{\ast}(Y)\rightarrow C^{\ast}(X)$. Moreover, we identifiy the image in
presice way by using the Hodge filtration on Hochschild cohomology. In
particular, when $X=Y$, we describe the fundamental group of the identity
component of the monoid of self equivalence of a (rationalization of) space $X$
i.e., $\pi_{1} Aut(X_{\mathbb{Q}})_{id}$.
