Hermansson said being successful at sport was a central aspect of New Zealand's national identity. The country's standing on the world's sporting stages "takes on a significance beyond its reality".
He added that New Zealand's "well-ingrained" national characteristic was that "we seem to have to strive to 'not let people down' and this feeds into the struggle."
Hermansson said as national expectations grew and the consequences of succeeding, or not, became over-exaggerated, the issue became more pronounced.
"As a nation we ... are very critical when [players] do not produce as desired."
Hermansson said it was important for the New Zealand squad to focus attention on the mental aspects they could control - citing attitude, desire, presence, competitiveness, confidence, focus "and, especially, enjoyment".
He believes playing the Cup at home will help, citing the 2011 Rugby World Cup as evidence of that.
"[The All Blacks'] mental struggle was very much evident in their final performance against France. You could say that we choked and won at the same time," he said.
The more the nation embraced and "demonstrably" supported the New Zealand team, and the more the players sustained attention on their efforts rather than the outcome, "the more likely the current momentum will continue through the campaign".
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