Bentley was driving over the same bridge he crossed every day on his way to work, but today nothing about the bridge or scenery felt familiar. This is an example of:

Retrograde Amnesia

Explanation:

Retrograde Amnesia is a type of amnesia often characterized with the inability of an individual to recall events that occurred in the past or information that was learned in previous times.

It has the tendency to affect memories such as episodic, declarative and as well autobiographical memory negatively, starting with the recently found memories, it then move towards older memories, such as childhood memories in adult.

Unlike Anterograde amnesia, it does not stops individual or patient from creating new memories after after having retrograde amnesia.

It is often caused by Dementia at a gradual pace.

Therefore, Bentley is showing symptoms of amnesia, by his inability to remember the bridge and road he has been passing for sometimes, which is an episodic memory; involving geographical location. It is then concluded that, this is an example of Retrograde Amnesia.

dissociative amnesia

Explanation:

Dissociative amnesia can be described as a form of disorder marked by an inability to recall important personal events and information. It can be of many forms, such as localized, selective, generalized, or continuous.

This form of disorder makes an individual to not to remember or recall past events, places and activities.

Bentley's inability to identify a bridge on the road he has been using every day is an example of Dissociative amnesia.