He is noted for his work on Ideal observer theory and radical empiricism.

The world is a mosaic of diverse experiences that can only be understood through "radical empiricism".

James had founded a new school of philosophy, called "radical empiricism," and nondual sciousness was its starting-point.

He calls it "logical realism in epistemic correlation with radical empiricism."

But there is something paradoxical in the idea of radical empiricism itself.

Telesio, on the other hand, began from an Aristotelian basis and, through radical empiricism, came to believe that a living force was what informed all matter.

His position is more or less the same as that of James, although he does not himself use the term 'radical empiricism' but rather 'immediate empiricism'.

Ayer explains that his radical empiricism is opposed to rationalism.

James is also known for his radical empiricism which holds that relations between objects are as real as the objects themselves.

James' plans for a book on radical empiricism based on this list never came to fruition.