One week later , they received repeatedly vehicles ( saline , DMSO , saline+DMSO ) , scopolamine ( 2 microg/0.5 microl saline/side ; 30 min before training ) , ritanserin ( 2 , 4 and 8 microg/0.5 microl DMSO/side ; 20 min before training ) and scopolamine ( 2 microg/0.5 microl ; 30 min before ritanserin injection ) +ritanserin ( 4 microg/0.5 microl DMSO ) through cannulae each day .
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