vulcan redshirt wrote:
Although it was needed for the plot, I don't quite get why Spock loses his abilities for logic. I always thought it was a learned skill, not a biological issue. Even when taken back in time, Spock still had all his memories, and learned skills.
It goes back to the event in The Immunity Syndrome where Spock knows that the four hundred Vulcans aboard the Intrepid just die, he "... could hear the death scream of four hundred Vulcan minds crying out over the distance between us."
Spock was also aware that the crew of the Intrepid never knew what was killing them. All this while Spock was separated from them by multiple light years.
Vulcans apparently share some kind of low level species consciousness, a group gestalt.
Five thousand year before the 23rd century, Vulcans were warlike barbarians. Spock was picking up on this, it was influencing his thinking, his actions and his feelings.