What to Do If You Blank in Your PhD Viva
Blanking in a viva is one of the most common fears doctoral candidates have. It happens. Examiners know it happens. What matters is not whether you blank, but what you do in the thirty seconds after.
Why blanking happens
Blanking is almost always a stress response, not a knowledge gap. The information is there. The combination of adrenaline, social pressure, and the strangeness of being formally examined retrieves it more slowly than usual.
Candidates who have practised answering questions under pressure blank less often. Not because their knowledge increased, but because the format became familiar enough to lower the stress response.
What to do in the moment
Ask for the question to be repeated. This is not a sign of weakness. It gives you four or five seconds and resets the cognitive loop. Most examiners expect this to happen at least once in a session.
Say what you do know before saying what you are unsure of. "I know that the literature on this divides broadly into two positions..." buys you time and signals engagement. Starting with "I am not sure" and stopping there is the worst option.
Ask to come back to it. "I want to give that question the answer it deserves. Can I return to it after we discuss the methodology section?" Examiners will almost always agree. Then make sure you return to it.
What you should never do
Do not guess wildly and hope it sounds convincing. Examiners are subject-matter experts. A wrong guess confirms a gap; a guess that is right but clearly improvised confirms shallow understanding.
Do not apologise repeatedly. One acknowledgement that you need a moment is appropriate. Ongoing apology shifts the examiner's attention from your knowledge to your anxiety, which is not where you want it.
How to reduce the risk before your viva
The most effective preparation against blanking is exposure to questioning before the day. Candidates who have been questioned on their thesis — even once, by a colleague reading questions aloud — blank far less frequently. The format becomes familiar.
Specific preparation for the questions you fear most reduces blanking on those questions. If the contribution question makes you anxious, practise it until the response is automatic. Automatic responses do not blank.
A note on imposter syndrome
Many candidates who blank are not blanking because they do not know the answer. They are blanking because they do not believe they are allowed to know it. The inner monologue is "I should not be here" rather than "I do not know this."
This is endemic in PhD culture, particularly for first-generation academics and candidates from underrepresented groups. Recognising it does not make it disappear, but it changes what you do about it. The answer is not to study more. It is to practise defending knowledge you already have.
PanelReady puts you through a full mock session on your own thesis. The follow-up questions are the same pressure as the real viva. Familiarity with that pressure is what prevents blanking.
Practise under examination pressure →