The Swede struck in the draw with Everton last weekend, his 19th goal of an injury-plagued season.
Ahead of tomorrow's clash with Fulham, Howe said: "Isak's form has given us a massive lift. It's always the way when you have got any attacking player on form, it transfers through the team. He is in a really good place, both mentally and physically.
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"It is great to see the form he is in. The team has given him the platform to show his talent, but I think he can get even better and there is more to come from him."
Howe also said of fellow striker Callum Wilson's injury recovery: "Callum is doing the hard yards. He is running hard. It is an upper limb injury so he can keep fit and when he is ready to come back I think he will be looking good."