So, the first main principle of classical conditioning is acquisition, first stage of learning when a response is evoked and slowly strengthened (Kendra, 2013). At this stage, NS-UCS pairings must be occurred several times or a very intense, tragic or aversive event with one occurrence of NS-UCS pairing could elicit a strong CR (Michael & Ronald, 2009). For instance, the person had an experience of free-fall in a lift during blackout. After that, when
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