Attention Span Curve When Doing a Sales Presentation. In this video Sales Training expert and speaker Victor Antonio talks about the attention span of a listener or client during sales presentation. The best sales presentation use Pattern Interrupts to raise the client's level of attention so they don't go off on 'thought tangents' while your delivering a key point or message in your sales presentation. You can find more Sales Influence moments at www.VictorAntonio.com or www.SalesInfluence.TV