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Consider the following expression as read by a person familiar with mathematical notation:

[displaymath5894]

The experienced reader is able to quickly scan the above expression and, while perusing the denominator, access the numerator. This ability is a consequence of internalizing the underlying structure conveyed by the visual layout and using it to traverse the information. The atomic actions in accessing the numerator are:

- Mark current node.
- Read previous sibling.
- Return to marked node.

We enable audio browsing by allowing a listener to perform the same kind of traversals. AsTeR internalizes a sufficiently rich structure to permit all of these browsing actions.

TV Raman

Thu Mar 9 20:10:41 EST 1995