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As an animal swims through the Lashley III maze, an observer types into a Macintosh computer the path taken. The computer program, Observe Software, then breaks the string of choices into two-step sequences and counts the number of such sequences. These data are then sent to a spreadsheet, where the sequences are sorted into forward and backward responses.… (More)
We describe a shortened procedure for testing mice over a 5-day interval on a swimming version of the Hebb-Williams maze. The mice are given 1 day of adaptation training, and are tested over the next 4 days on Hebb-Williams problems 1, 6, 12, and 5, in that order. As an animal swims through one of the maze problems, the computer screen shows the maze… (More)
Levels of voluntary consumption of ethanol were obtained which were sufficient for use in developing a nonhuman primate model of heavy drinking.
Measures of toy play including duration and tempo of play were obtained for a combined sample of 7 male and 5 female infants 22 to 26 mo. of age. Additional measures of reaction to frustration were obtained during a second session where toys were placed out of reach of the subjects. Measures of frustration included crying, squirm/escape attempts, and… (More)
Six adult female rhesus monkeys (Macaca mulatta) performed food-reinforced button presses in a compound stimulus discrimination paradigm. Three subjects were trained on a compound stimulus consisting of a color motion picture of an adult male rhesus superimposed over a homogeneous blue field of color. A second group of three subjects was trained on a… (More)
A self-stimulation choice technique was used to assess visual preferences in 4-mo--ld infants for slides of stimuli-depicting smiling vs neutral facial expressions. Preferential self-selection of stimuli did not occur even in the presence of preferential looking responses by infants.