Eventually, trained mice would 'freeze' in chamber A even without the shock.īrain cells activated during memory formation were genetically labelled with a blue light-sensitive protein to allow their visualisation and re-activation. In the study, mice were first trained to associate a mild foot shock with a specific environment, known as chamber A, eliciting a typical 'freezing' behaviour. 'Amnesia is a problem of retrieval impairment.'
'The majority of researchers have favoured the storage theory, but we have shown in this paper that this majority theory is probably wrong,' Susumu Tonegawa, a professor at the Massachusetts Institute of Technology, said.
