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spec: The source of the radioactivity had not been determined but the view was expressed that it had come from a leak of some sort , perhaps the roof , and further that the area could be covered over and prevent further spread . In their task hippocampal lesions produced a deficit in discrimination performance ( possibly because of the procedure they used to break position habits , possibly because of the extensive trial-and-error behaviour generated ) ; but , more importantly , they found that the hippocampal animals showed low levels of vicarious trial-and-error behaviour ( i.e. movement of the head from the S + to the S - or vice versa within a trial ) compared to controls , with the high control levels dropping to lesion levels as their performance reached an asymptote . further efforts to build mature and sustainable programs . The NAD has been active in Washington and around the country in helping to shape national policy across a broad spectrum , including education , employment , and health care . Pruning out infected wood and removing flower buds and fruit from young plants , pruning mature bushes to thin crop loads , and minimizing drought and other plant stresses appear to be the best methods of control . Sandy / K / Mo - I let them do the scribble writing but have them draw a picture that explains their writing . If the teacher were presenting Kenny 's dilemma to a class ( rather than interviewing a child ) , she would ask Socratic questions that would try to draw out higher-stage thinking and get less mature children to respond to the reasoning offered by more mature peers . Other times we fail to plan for the mature growth habit of the tree in complex urban environments . `` Unfortunately for prosecutors , few cases are that easy .