Perceptual organization of auditory temporal patterns in European starlings (Sturnus vulgaris)

The perception of continuously repeating auditory patterns by European starlings was explored in seven experiments. In Experiment 1, 4 starlings learned to discriminate between two continuously repeating, eight-element, auditory patterns. Each eight-element pattern was constructed from different temporal organizations of two elements differing in timbre. In Experiments 2–7, the repeating patterns were transformed in ways designed to identify the starlings’ perceptual organization of the patterns. In Experiment 2, the starlings identified patterns beginning with novel starting points. In Experiment 3, discrimination performance was adversely affected by reorganizing the elements in the patterns. In Experiments 4 and 5, the pattern elements were altered. In Experiment 4, the patterns were constructed from two novel elements. In Experiment 5, the temporal location of the two pattern elements was reversed. The transformations of the patterns in Experiments 4 and 5 affected discrimination performance for some, but not all, of the starlings. In Experiments 6 and 7, replacing either of the two elements with silent intervals had no effect on discrimination performance. The results of these experiments identify basic grouping principles that starlings use when they perceive auditory patterns.     

The other side of the coin: Cognitive properties of nonreward

In this comment, I examine Amsel’s theory in the light of rats’ reaction not to frustrative non-reward per se, but to the more complicated case in which frustrative nonreward is part of a rule-based sequence of reward quantities. The discussion goes beyond Amsel’s emphasis on dispositional memory to consider cognitive and representational memory—the signaling properties of reinforcement and nonreinforcement. The strengths and weaknesses of Amsel’s theory are discussed with the fresh perspective that this viewpoint provides, and some issues emerge that may be fruitful for further study.     

Structural complexity as a determinant of serial pattern learning

A new methodology extends the study of serial pattern learning to nonhuman organisms by constructing patterns using elements that are both familiar and motivationally meaningful to animals. Two experiments examine the ability of rats to anticipate various quantities of food as measured by running times in a runway when the quantities occur in a serial order. In Experiment 1, a serial monotonic pattern (14-7-3-1-0 food pellets) produced more rapid learning and more accurate anticipation of the various quantities (“tracking”) than a serial nonmonotonic pattern (14-1-3-7-0 food pellets), particularly with respect to the final 0-pellet element. In Experiment 2, the same monotonic pattern generated faster learning and more accurate anticipation of pattern elements than a weakly monotonic pattern (14-5-5-1-0 pellets). Associative explanations including simple excitatory or inhibitory effects, temporal anticipation, reinforcement contrast, and the number and discriminability of pairwise associations are not adequate to account for the data. Rather, the formally defined structural complexity of each pattern adequately predicts its relative difficulty.     

Relative pitch perception in the European starling (Sturnus vulgaris): further evidence for an elusive phenomenon

Relative pitch perception in animals has been difficult to demonstrate. This failing is due in part to stimulus sets that make an absolute pitch solution viable. In Experiment 1, starlings failed to acquire a discrimination that could be solved only on the basis of relative pitch. In Experiment 2, starlings were trained on a smaller set of pitch patterns, for which both absolute and relative pitch solutions were available, then tested with three series of unreinforced probe stimuli. Series 1 assessed stimulus control by absolute pitch. In Series 2, absolute pitch cues dictated one response, and relative pitch cues dictated a different response. Results indicate that starlings extract relative pitch from artificial pitch patterns only after acquiring a discrimination that permits both absolute and relative pitch solutions. Results are discussed in terms of the relative salience of absolute and relative pitch.     

Children's self-presentations with infants: Gender and ethnic comparisons

The assumption of differential socialization experiences lead to the hypothesis that African American children would be less stereotyped in their responses to infants than White American children. This study of fifty-three 8–10-year-old children from African American and White American working-to-middle class families supported the hypothesis. The children were photographed with a peer, an infant, and with an infant while acting as a parent. All children stood significantly closer to the infant in the role condition and exhibited more attraction behavior. As predicted, gender differences were evident between White girls and boys, but not between African American girls and boys. Findings suggested that social preferences for infants cannot be necessarily linked to gender. Discussion of the findings from earlier study with younger children (Reid et al., 1989) supported this conclusion.We gratefully acknowledge Carol S. Tate for her assistance in data collection and analysis, and Jeannie M. Shook for coding. This research was supported in part by a faculty research grant given to the first author by the University of Chattanooga Foundation (R04-106830)     

Dynamics and Techniques of Group Psychotherapy in Private Practice

In rearing a mentally retarded child, parents are confronted with a number of taxing stresses and problems. As a result, many in this parent population need and could benefit from a social support network. Unfortunately, such networks often do not exist or parents make no effort to join them. One seemingly useful means of providing a facilitative social system for parents of retardates is via the support group. In this article, two support groups—each developed to assist parents in adjusting to their retarded children—are described. Also, the process stages of these groups are discussed.