Basically memory & learning occurs at synapses,which are junctions of brain cells called neurons.These synapses occur on dendritic spines, which are structures that are specialized protutions on neurons.In their study ,they found out that the corticotrophin releasing hormone played havoc on the dendritic spines when an animal was stressed.
''stress is constant in our lives.Our findings can play an important role in the current development of drugs that might prevent these undesirable effects and offer insights into why some people are forgetful or have difficulty retaining information during stressful situations."said lead researcher Dr.TZBaram.