In the following example a title attribute is used in conjunction with a null alt (alt="") a null alt maps to role=presentation as per HTML5 and will not be represented in the accessibility tree (elements with role=presentation are removed from the acc tree), thus the title attribute content will not available to users of assistive technology. Furthermore the use of title in this instance is strongly discouraged as it is not accessible to a range of users due to poor implementation.

http://www.w3.org/TR/2012/WD-html5-20121025/the-img-element.html#general-guidelines

"<article>
 <h1>Fluffy and the Yarn</h1>
 <p>Fluffy was a cat who liked to play with yarn. He also liked to jump.</p>
 <aside><img src="fluffy.jpg" alt="" title="Fluffy"></aside>
 <p>He would play in the morning, he would play in the evening.</p>
</article>"

Suggest:

<article>
 <h1>Fluffy and the Yarn</h1>
 <p>Fluffy was a cat who liked to play with yarn. He also liked to jump.</p>
 <figure>
<img src="fluffy.jpg">
<figcaption>Fluffy</figcaption>
</figure>
 <p>He would play in the morning, he would play in the evening.</p>
</article>