Final answer:
Collins and Loftus modified the original semantic network theory by introducing the concept of spreading activation. Their model accounts for the typicality effect.
Step-by-step explanation:
Collins and Loftus modified the original semantic network theory by introducing the concept of spreading activation. According to their model, activating any part of a semantic network also activates the associated concepts to a lesser degree. This spreading activation allows for easier access to related concepts when remembering or recalling information. Their model accounts for the typicality effect, which suggests that people are more likely to remember and recognize the most typical or prototypical members of a category. For example, if asked to think of a bird, most people will think of a sparrow rather than a penguin.