What condition is Ken most likely experiencing based on his symptoms?

Ken's symptoms most likely align with vertigo, which is characterized by a sensation of spinning or movement despite being stationary. This condition often results from issues in the inner ear or vestibular system, impacting balance. Individuals experiencing vertigo may describe their surroundings as moving or themselves as spinning, which fits the typical presentation of this condition.

In contrast, dizziness refers to a general feeling of lightheadedness or unsteadiness without the specific sensation of spinning. Syncope involves a sudden, temporary loss of consciousness, which does not describe the spinning sensation associated with vertigo. Tinnitus involves ringing or noise in the ears and does not connect to the spatial disorientation that defines vertigo. Therefore, given the symptoms presented, the condition Ken is most likely experiencing is vertigo.