"jacob cannot remember anything that occurred in the minutes leading up to the bicycle accident that knocked him briefly unconscious. this mild form of amnesia is most likely due to the head injury preventing memory "

"jacob cannot remember anything that occurred in the minutes leading up to the bicycle accident that knocked him briefly unconscious. This mild form of retrograde amnesia is most likely due to the head injury preventing memory retainment."

In the question presented above, "Jacob cannot remember anything that occurred in the minutes leading up to the bicycle accident that knocked him briefly unconscious. This mild form of retrograde amnesia is most likely due to the head injury preventing memory retention."

Retrograde amnesia: this type of amnesia that occurs when an individual is not able to recall incidents that took place before amnesia developed. In other words, the inability of an individual to recollect things that happens in the past before an injury is called retrograde amnesia. Individual affected generally remember meanings and actual information, but are unable to recall specific events.  

Although, individual may also be able to encode and remember new events that happens afterwards.  When the damage to the brain does not affect hippocampus (parts of the brain that encodes new memories), it will result to retrograde amnesia. This is because, the neuron and other different regions of the brain is where the already long-term memories are stored.  

For instance, if the Broca’s or Wernicke’s parts of the brain are damaged, it will result into language related memory loss, due to the fact that broca’s and wernicke’s connected to language information and speech production.  It is caused by the damage to the brain region associated with declarative memory (episodic)

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the branch of biology that deals with the normal functions of living organisms and their parts.

the way in which a living organism or bodily part functions.