LOS ANGELES - Actor Bruce Willis' wife is giving the public an update on his health as he battles aphasia, more specifically frontotemporal dementia.

Emma Heming Willis recently spoke with ABC News' Diane Sawyer for an upcoming special, airing Tuesday night.

What they're saying:

"Bruce is still very mobile. Bruce is in really great health overall, you know," she said. "It's just his brain that is failing him."

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"The language is going, and, you know, we've learned to adapt," she added. "And we have a way of communicating with him, which is just a ... different way."

But Heming has pointed out some highlights.

"Not days, but we get moments," Heming explained to Sawyer. "It's his laugh, right? Like, he has s

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