Overriding the paragraph style in the LNCS document class

I am using the LNCS document class to typeset a paper. I would like to keep most of this document style, but I do not like how paragraphs are typeset. The heading of the paragraph is in italics, which is not enough contrast to the rest of the text. I would like to change this to bold text.

How can I override the paragraph style, being minimally invasive?

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Could you provide a minimal working example (MWE) of your paragraph usage that displays the current, unwanted behaviour? It avoids having to re-invent the wheel to get at the point you're at. –  Werner Sep 20 '13 at 15:33
Are you planning on submitting your document to LNCS? If you are, it's best not to modify their style. –  Nicola Talbot Sep 20 '13 at 15:34
`\usepackage{etoolbox}\patchcmd{\paragraph}{\itshape}{\bfseries\boldmath}{}{}` should be sufficient. But I have a couple of doubts: (1) if you're using the class for submitting to Springer, don't modify the style; (2) `\paragraph` is the fourth level of sectioning: are you sure you want to use it and give it much prominence? Moreover, you'd get the same as `\subsubsection`. –  egreg Sep 20 '13 at 15:38
@NicolaTalbot Not submitting to Springer and the LNCS style is not required, so patching is okay. –  clstaudt Sep 20 '13 at 15:49
@clstaudt `\subsubsection` already does that. –  egreg Sep 20 '13 at 15:56

``````\usepackage{etoolbox}
\patchcmd{\paragraph}{\itshape}{\bfseries\boldmath}{}{}
``````

However, this will make the typesetting of `\paragraph` titles very similar to what's already done for `\subsubsection`.

As far as I understand, the `llncs` class has three levels of sectioning, corresponding to `\section`, `\subsection` and `\subsubsection`. The last one is unnumbered by default.

The example document uses `\paragraph` for comments about proofs or similar things, so just as a “special paragraph” of text. I believe this is good usage, but I wouldn't give these special paragraphs much prominence than they already are given with the title in italics.

Trust me: a paragraph starting with a title in italics and preceded by some vertical space is noticeable. Rather, it's more questionable that there is no vertical space at the end of this special paragraph.

You can define a `comments` environment that remedies to this situation:

``````\newenvironment{comments}[1]
{\paragraph{#1}}
Don't abuse `\subsubsection` for this purpose.