Selective looking by infants

Previous studies of selective looking have shown that adults and young children can easily follow one visually specified event while ignoring another on which it is optically superimposed. The present experiments show that 4-month-old infants have the same ability. Two films were shown superimposed on the same screen, while one soundtrack was played in an attempt to influence the subjects' perceptual selection. When the films were separated during test periods, the infants looked mostly at the previously silent film, suggesting that it was novel for them. Control experiments showed that completely unfamiliar films elicited comparable novelty preferences in the same situation, that the soundtrack could also influence perceptual selection during side-by-side presentation of the same films, and that cross-modal habituation to the soundtrack alone could not account for the results. Perception is inherently selective, even in the first months of life.     

Monaural right-ear advantage in a target-identification task

Subjects were monaurally presented with consonant—vowel syllables to the right or left ear, with or without simultaneous noise to the other ear. The subject's task on each trial was to indicate whether or not the item presented was the target item /ba/. A right-ear advantage in reaction time was obtained: 14 msec for target items, 6 msec for nontarget items. The size of this effect was comparable in the presence vs. absence of competing noise. No consistent individual differences were found in the size of the right-ear advantage for this task, although such differences were obtained in a dichotic-perception pretest.It is argued that data of this type do not permit inferences about the use of particular ear/hemisphere neural pathways.     

Semantic priming effects for stimuli presented to the right and left visual fields

Studies that have addressed the possibility of hemispheric differences in semantic priming effects have yielded contradictory results. This paper reports the findings of two experiments intended to shed greater light on the issue of hemispheric differences in semantic priming. Experiment 1 used a hemiretinal paradigm and examined manual response latency and response accuracy to four types of word pairs; categorically related, syntactically related, unrelated, and pairs containing a nonword member. Experiment 2 examined the effects of unrecognized, disambiguating flank words on verbal responses to a centrally presented homograph. Experiment 1 yielded no significant visual field differences in magnitude of priming effects when response latency served as the dependent measure, although categorical relatedness facilitated response accuracy for left but not right visual field stimuli. In experiment 2, the disambiguating words had a significant effect on meaning interpretation of the homographs that was independent of visual field of presentation. Taken together, the results of these studies are interpreted as indicating that semantic aspects of linguistic input are automatically processed and can influence the content and latency of subsequent responses, whether presented to the left or right visual field.     

The minimum principle and the perception of absolute,common, and relative motions

Wheel-generated motions have served as a touchstone for discussion of the perception of wholes and parts since the beginning of Gestalt psychology. The reason is that perceived common motions of the whole and the perceived relative motions of the parts are not obviously found in the absolute motion paths of points on a rolling wheel. In general, two types of theories have been proposed as to how common and relative motions are derived from absolute motions: one is that the common motions are extracted from the display first, leaving relative motions as the residual; the other is that relative motions are extracted first leaving common motions as the residual. A minimum principle can be used to defend both positions, but application of the principle seems contingent on the particular class of stimuli chosen. We propose a third view. It seems that there are at least two simultaneous processes—one for common motions and one for relative motions—involved in the perception of these and other stimuli and that a minimum principle is involved in both. However, for stimuli in many domains the minimization of relative motion dominates the perception. In general, we propose that any given stimulus can be organized to minimize the complexity of either its common motions or its relative motions; that which component is minimized depends on which of two processes reaches completion first (that for common or that for relative motions); and that the similarity of any two displays depends on whether common or relative motions are minimized.     

The effect of lateral visual fixation on response latency to verbal and spatial questions

The results of several studies have suggested a relationship between lateral eye movements and contralateral hemispheric activation or ipsilateral inhibition. The present study investigated the effects of lateral and central eye fixation on response latency to verbal and spatial questions. Response latencies for verbal questions were significantly longer when subjects fixated to the left or centrally, as compared to the right. On spatial questions, response latencies were significantly longer in the right fixation condition than in the other conditions. The results indicate that visual fixation ipsilateral to hemispheric activation is related to slower problem solving, and suggest that eye movements during cognitive activity may have functional significance.     

Infants' intermodal perception of events

Four-month-old infants viewed two sound motion picture films of simple, natural events. The films were projected side by side, as one of the two sound tracks was played through a centrally placed speaker. Infants' visual attention to the films was consistently influenced by what they heard: They looked primarily at the event specified by the sound track. The experiment demonstrates that infants are able to perceive relations between sights and sounds in the absence of spatial cues. They respond to a perceived intermodal invariance with increased attention to the event reaching them over two modalities.     

Blowing in the wind: Perceiving structure in trees and bushes

When lights are mounted at the ends of the limbs of a tree and the surround darkened such that branches and trunk are not visible, viewers can nonetheless make systematic and precise judgments about the unseen structure of the tree through its motion. They seem to perform this task by picking up information about the relative arborization of the tree through the vector paths of the lights on the limbs. Theoretically speaking, the focus of this study is on the perception of second-order centers of moment; previous studies have focused on the perception of first-order centers. A second-order center in a tree-like structure is the location where limb meets trunk, and it is these that perceivers can infer from the dynamic display. The importance of this study is to demonstrate further that the study of centers of moment makes possible a detailed and differential study of event perception.     

The more things change…: Metamorphoses and conceptual structure

Given that mythmakers must construct stories that are comprehensible to their audience, it is reasonable to expect stories to be conceptually natural even when their topics deal with the supernatural. Thus, as stories are adapted to human conceptual structure, they should reflect characteristics of that structure. An examination of the types of magical transformations in Ovid's Metamorphoses and Grimms' Fairy Tales suggests that this is the case. It was possible to predict the patterns of transformations on the basis of structural properties of ontological knowledge, which is knowledge of the basic categories of existence (e.g., conscious beings, animals, plants, events). Other characteristics of the transformations seem to reflect the conceptual distinction between animates and inanimates as well as the relative prototypicality of various taxonomic classes of animals. It appears that aspects of conceptual structure can constrain patterns of thinking even during “the willing suspension of disbelief.”     

Mid-career change in academia: The decision to become an administrator

This study explored the reasons why professors would leave their teaching/ research occupations to begin new careers as administrators. Valence-Instrumentality-Expectancy theory of occupational preference and choice was used as a framework to examine mid-career change among professors and department chairmen at a major university. Data showed that professors' intentions to change careers and become administrators could be explained by the theory. Analyses of job characteristics demonstrated that professors who want a mid-career change are primarily attracted by the power and formal authority vested in the administrative position, while professors who prefer to remain in their career paths do so because of the autonomy it offers.     

Semantic knowledge as a determinant of developmental differences in recall

Two experiments examined the possible role of children's semantic knowledge and their ability to encode it in a cued-recall test. Performance of children aged 7, 10, and 13 was observed in encoding specificity tasks, which used homographs as the to-be-remembered words (TBRs).In Experiment I, children of all ages performed better when the output cue words prompted similar meanings to the input cues, than when output and input meanings were incompatible. In Experiment II, all children were required to recall identical items, but younger children, owing to lack of knowledge, were unable to encode pairs comprising input and TBR words incompatibly with output cues. In such circumstances, younger subjects outperformed older subjects. When input and output cues were incompatible for all ages, recall increased with age, possibly due to older childrens' using more effective retrieval strategies.The findings indicate that semantic encoding influenced recall performance at each age. This suggests that age differences in memory are due to differences in the amount of semantic knowledge a child possesses for encoding and cuing and not to capacity differences.     

Locus of control and career self-management among nonsupervisory employees in industrial settings

The effects of locus of control on career self-management and career experiences of nonsupervisory workers were examined in different organizational environments. In organizational settings which encouraged personal initiative in career development through personnel policies and promotion practices. Internals played a more active role in their career progress than Externals by initiating their own job searches, and they had more favorable career experiences. In situations which hampered self-initiative, locus of control had little effect on career self-management and subsequent job experiences.     

Genetic and environmental influences on person-situation interactions

Genetic and environmental influences on person-situation and person-mode of response interactions for anxiety and for dominance were investigated in an adult twin sample. For anxiety, evidence of significant genetic variance was found for the person-situation interaction and the person-mode of response interaction. For dominance, evidence of shared sibling-environmental influences was found for the person-situation interaction. Sex differences in the patterns of findings were also examined. The data indicate that the factors influencing personsituation interactions vary depending on the specific trait studied, and the results provide empirical support for the “interactionist” hypothesis that an individual's behavior can be characterized by meaningful patterns of behavior across situations. In addition, the study illustrates that behavior-genetic research can be designed to address important theoretical questions about the nature of personality.     

Selective looking: Attending to visually specified events

Subjects looked at two optically superimposed video sccreens, on which two different kinds of things were happening. In the principal condition, they were required to follow the action in one episode (by pressing keys when significant events occurred) and ignore the other. They could do this without difficulty, although both were present in the same fully overlapped visual field. Odd events in the unattended episode were rarely noticed. It was very difficult to monitor both episodes at once. Performance was no better when the two episodes were presented to different eyes (dichoptic condition) than when both were given binocularly. It is argued that selective attention does not involve special mechanisms to reject unwanted information, but is a direct consequence of skilled perceiving.     

Shareability: The social psychology of epistemology

Psychologists and cognitive scientists interested in the nature of internal representations of human knowledge often use observable regularities or structures to infer what the innate constraints on those representations must be like. It is possible, however, that certain structures might come about only when a group of people share a knowledge domain. Furthermore, it is possible that there are analyzable constraints on knowledge structures that emerge when knowledge is being shared. Such constraints are referred to in this paper as “shareability” constraints. A number of examples of observable structures in human knowledge are discussed in terms of shareability constraints. An attempt is made to determine which sorts of structures are most shareable, and how those structures may differ from the sorts of structures that are easily represented by the individual mind but not easily shared between minds.     

A follow-up developmental study of hypothesis behavior among mentally retarded and nonretarded children

To clarify the roles of IQ and mental age (MA) in hypothesis behavior, MA-matched subjects at three levels of IQ (70, 100, and 130) and three levels of MA ($\text{5}\text{1}\text{2}\text{, 7}\text{1}\text{2}\text{,}\text{and}\text{9}\text{1}\text{2}\text{years}$) received blank-trial discrimination learning problems using procedures designed to discourage position-oriented responding. With position responding discouraged, earlier findings were contradicted in that no hypothesis measure showed a main effect of IQ. This suggest that previously reported IQ group differences in hypothesis behavior may not reflect cognitive deficits inherently linked to low IQ, but instead may reflect the influence of specific methodological factors. The finding and interpretation are consistent with Zigler's (American Journal of Mental Deficiency, 1969, 73, 536–556) “developmental” theory of retardation and inconsistent with the general “difference” position. In additional findings, the predictions that subjects at all three MA levels would use hypotheses, and that retarded children from special-education classes would use hypotheses more often than retarded children “mainstreamed” in classes for the nonretarded were confirmed.     

The structure of coordination in first language acquisition of Mandarin Chinese: evidence for a universal

This study exemplifies a type of cross-linguistic research which is based on the theory that certain parameters of natural language variation are central to the human competence for language. Sensitivity to these parameters allows the child to develop various specific language structures which follow from setting the parameters. Results of this study provide evidence that children are universally sensitive to one such parameter, namely, Principal Branching Direction.Data are based on results of a standardized elicited imitation test of 68 Chinese children in Taiwan between 2;0 and 4;5 with mean age of 3;3. The test is on a set of coordinate sentences. The results show that children acquiring Mandarin Chinese (a left-branching language) systematically prefer VO sentences with a backward reduction pattern ([V + V]O) over those with a forward reduction pattern (V[O + O]).Children's responses to SV coordinate sentences differ systematically from their VO responses. They very frequently reduce redundant subjects in a forward direction (in SV sentences) and do not prefer backward reduction ([S + S])V) over forward reduction (S[V + V]) in these SV sentences.This paper suggests an explanation of this apparent paradox in terms of an interaction in early language acquisition between children's sensitivity to a predominant Chinese topic-comment structure (in SV) and their sensitivity to the abstract, specifically grammatical concept of “Principal Branching Direction”.     

Discriminative vocal conditioning in rhesus monkeys: Evidence for volitional control?

Both emotional and volitional systems are invoked in explaining the control of human vocalizations, but vocal behavior of nonhuman primates is often believed to be totally under emotional control. Monkeys' poor performance on conditioning tasks, especially discriminative conditioning of vocalization (DCV), has been cited as evidence against volitional control. In Experiment 1, rhesus monkeys failed a DCV task in which food was given for vocalizations emitted during an arbitrary visual stimulus, but in Experiment 2, monkeys showed clear discriminative performance when an otherwise comparable shock-avoidance DCV procedure was used. This evidence that monkeys possess some degree of volitional control has implications for the relation between animal vocalizations and the origin of human speech.