Psychological conventions.

The conventions of a psychological thriller are;

• There is normally a character with danger on mental level rather than a physical.
• Misleading stories, tricks and twists in the storyline.
• Unusual happenings - meaning some characters may hear voices, etc.
• Clever character who thinks ahead of everyone else - leads to isolation.
• Builds up to a final shocking reveal.
• Normally 2 or more characters prey on each others sanity - play tricks with each others mind.

Some psychological thrillers are;

• Mr Ripley
• Sixth Sense
• American pyscho
• Usual suspects 
• Fight club