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All other areas of gray matter investigated , including the basal ganglia , limbic regions , thalamus and midbrain , fall in a class 2 , in which supplemental dietary DHA did restore DHA concentrations to breastfed levels . Newspaper advertisements , daily radio programs and flyers informed the population about and helped them to understand the real purpose of the assessment ( at first rumors had spread that the research team would provide free medication for mentally disturbed individuals and created unreal expectations ) . " This is a remarkably hermetic picture , smaller than any other of his male studies of this decade and , perhaps because of this , more concentrated and refined in handling . In 1924 he made a ' film without scenario ' , Ballet Mecanique , in which he contrasted machines and inanimate objects with humans and their body parts . However , when infected cells were cultured in the presence of 1.25 μ g / ml or higher concentrations of THC , they remained indistinguishable from uninfected control cells and remained adhered to the plate .