A 46-year-old man with a history of epilepsy is admitted for breakthrough seizures and undergoes continuous EEG monitoring. Multiple electrographic seizures are captured. A representative epoch is shown below. Which of the following best describes the ictal onset and evolution?

• Left temporal onset with beta-frequency activity evolving into slower polyspike-and-wave activity
• Left parasagittal onset with alpha-frequency activity evolving into faster polyspike-and-wave activity
• Left parasagittal onset with beta-frequency activity evolving into slower polyspike-and-wave activity
• Left temporal onset with alpha-frequency activity evolving into faster polyspike-and-wave activity
• No definite electrographic seizure is present

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