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The current study examined the effects of dietary administration of glutamic acid and/or Vitmin B0 on operant behavior, activity, and open-field behavior in rats. Compared to controls, experimental subjects showed prolonged extinction of the lever-press task and entered more squares in the open-field. Experimental groups did not differ among themselves on these measures. No differences between experimental groups and controls were found for acquisition of the lever-press response, activity measured on an activity wheel, and number of defecations in the open-field. Results were partially supportive of previous studies showing significant effects of peripherally administered glutamic acid on measures of operant behavior.

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A study was conducted to determine if the serial position curve remains invariant acroea developmental levels under dserent rota verbal learning tasks when the curvea are expressed as Indices of Relative Difficulty. Eighty students, ages 5-11, from the University of Missouri-Columbia L8bOr8tO~y School aerved 88 subjects for this study. Each subject participated i n two experimental tasks, multitrial free reO8ll and serial recall, counterbalanced in presentation.Seven words for each of the two experimental tasks and for each of the two practice tasks constituted the list length. On each task, every subject received a different random order of the list. The data consisted of an error score, cumulated over five trials, at each of seven serial positions for each subject in two tasks. The data were transformed into the Index of Relative Difficulty, which was the method used in representing the serial position effect. The statistical analyses were a multiple discriminant analysis on the four age groups for each of the two k k s and a Hotelling T* analysis on the serial versus free recall mean vectors. All analyses were performed on the Index of Relative Difficulty. The analyses indicated that age or grade level in and of itself is not a 0i@cant faotor in changing the bowed skewed curve found in rote verbal learning tasks. The effect of serial position on the shape of the eerie1 position curve has been shown to be consistent with the findings of other investigators.

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