The signaling effect presents the increase in learning outcomes due to guiding and promotion of attention to relevant information. Signals are based on natural attention attractors like movement, contrast or sound. In multimedia this effect can also be achieved through various methods like¹⁾:

1. enumeration, → arrows, underlining,
2. bold text, italic text, coloring,
3. summaries or overviews.

Examples of signaling implementation in practice:

• preview summary paragraph²⁾
• section headings³⁾
• labels color change synchronized with a spoken explanation⁴⁾⁵⁾
• step-by-step presentation of diagram elements synchronized with a spoken explanation⁶⁾
• text underlining⁷⁾
• text capitalization⁸⁾

A recent research⁹⁾ has confirmed and attempted to explain the signaling effect using recorded eye movements data of the experiment participants. Some of the conclusions of this and similar studies concerning the signaling effect are:

• Signaling can guide attention to relevant information, which reduces cognitive resources normally assigned for search of information¹⁰⁾
• Eye-tracking studies confirmed that signaling results in more attention devoted to relevant information¹¹⁾
• Some studies have found increase in retention tests performance, but not on transfer tests¹²⁾, but others found positive effects of signaling on transfer tests, but not on retention tests¹³⁾¹⁴⁾
• In cases when signaling is used, time for finding information is usually reduced, but duration of time spent watching/processing this information increases when compared to no signaling conditions