Abstract
Ss were classified into shy and nonshy groups by means of the cage-emergence technique. A series of trials in either open or closed alleys were given, the last 2 serving as saline control trials for the drug stage. An equal number of shy and nonshy Ss were randomly assigned to sodium amytal or chlorpromazine and 3 open test trials were given. Shy animals hoarded less in the open than in the closed alleys, but there was no significant difference between the two groups in the closed alleys. Sodium amytal effectively increased hoarding in the shy Ss, but chlorpromazine failed to do so. Neither drug had a significant effect upon hoarding of nonshy Ss. The significance of these results was discussed in connection with hoarding levels of shy and nonshy Ss and the effects of the drugs on fear.
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