If a record was kept of presentation timing or an agenda of the meeting, it can be compared with the activity timeline to determine which presenters/slides triggered the most action. There’s a vertical line for each poll launched and a vertical line for each question asked. Hover over the lines to see the event details. Click-and-drag to zoom in.

Here's an example of a record you can keep to track the times.
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Tip: Sometimes people use an unanswered question to mark the change in speaker. You can see the question by hovering over its line. 

Contact support if you're interested in beta features with the Timeline.
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