Jess was in a serious car accident and is having trouble recognizing familiar faces. She MOST likely suffered damage to her lobe, just behind her right ear.

Temporal

Explanation:

Where one is involved in an accident and lost his or her sight, this can be regarded as face blindness or Prosopagnosia.  The person could be said to have suffered damage in his or her temporal lobe. The Temporal lobe is located behind the ears and extends to both sides of the brain, which is sensible for vision, memory, sensory input, etc. The damage in temporal loss can cause a loss of vision and can result in to face blindness. However, Jess's involvement in a serious car accident and his trouble recognizing familiar faces indicated that she has damaged her temporal lobe which is behind her right ear.

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