The influence of adaptation and stochastic fluctuations on spontaneous perceptual changes for bistable stimuli

Spontaneous perceptual change was studied by measuring the probabilities of the first two spontaneous pattern switches as a function of time following the onset of a bistable apparent quartet for which either horizontal or vertical motion is perceived. Contrary to the classical satiation hypothesis (Köhler & Wallach, 1944),differential time-dependent adaptation of the perceived compared with the unperceived motion directions was not necessary to account for the first spontaneous switch. In addition, adaptation of the perceived motion accompanied by recovery from adaptation of the unperceived motion was not necessary to account for the increased probability of the second spontaneous switch. It was concluded that regardless of possible adaptation effects, stochastic fluctuations are necessary for the actual reversal of activation levels that produces the spontaneous switch. When the difference in detector activation is reduced by differential adaptation of competing motion detectors (or by the occurrence of a prior spontaneous pattern change), smaller stochastic fluctuations are sufficient to reverse the relative activation of competing detectors. Thus, adaptation can increase the probability of spontaneous switches without directly causing them.     

APPROXIMATING CHAOTIC BEHAVIOR

Abstract— Human subjects received feedback showing how closely their responses approximated the chaotic output of the logistic difference function. In Experiment 1, subjects generated analog responses by placing a pointer along a line. In Experiment 2, they generated digital responses in the form of three-digit numbers. In Experiment 3, feedback was sometimes provided and other times withheld. Responses came to approximate three defining characteristics of logistic chaos: Sequences were "noisy," they were extremely sensitive 10 initial conditions, and lag I autocorrelation functions were parabolic in form. Chaos theory may describe some highly variable although precisely determined human behaviors.     

Selecting analogous problems: Similarity versus inclusiveness

Students were asked to select one of two analogous problems in order to solve algebra word problems. In Experiment 1, one problem was less inclusive and the other was more inclusive than a test problem. The students judged the complexity and similarity of problems, selected analogous problems, and used the solutions to solve test problems. They performed significantly better on the test problems when given the more inclusive solutions, but used perceived similarity rather than inclusiveness to select analogous problems. The same pattern of results occurred in Experiment 2, in which isomorphic problems replaced the more inclusive problems. The results show that students are deficient in selecting good analogies, both from the same category (Experiment 1) and from a different category (Experiment 2). Students who saw the analogous solutions (Experiment 3) or were majoring in mathematics (Experiment 4) were more likely to select an isomorphic problem over a less inclusive problem, but were not more likely to select a more inclusive over a less inclusive problem.     

Knowledge of one's own responding and the relation of such knowledge to learning: A developmental study

First-, third-, fifth-grade children, and college students (ages 6, 8, 10, and 19 years) acquired a paired-associate list under the study-test procedure to a one error-less trial criterion. In addition, as each pair was presented the individual indicated whether he/she had that pair correct on the immediately preceding trial (postdiction responses). The data were interpreted in terms of a discrimination-utilization hypothesis which postulates that individuals discriminate their own correct and incorrect responses on a given trial and use this information for distributing processing effort on the subsequent trial. Analyses involving the accuracy of postdiction responses, the relation of postdiction accuracy to acquisition, and the consideration of the acquisition data in terms of a two-stage model led to the conclusion that older children and adults may use the discrimination-utilization strategy but younger children tend not to use it, probably because of both mediation and production deficiencies.     

Recall and anticipation methods in probabilistic associative learning1

Six S-R₁ S-R2 modified paired-associates were presented for 60 trials. A 2 by 6 factorial design was employed in which method, recall or anticipation, and the S-R₁, S-R₂ probability-ratio were varied. The S-R₁ S-R₂ ratios were: 1.00-0.00, .90-.10, 80-.20, .70-30. .60-.40, and .50-.50. The results indicated that the recall procedure yielded superior performance in early acquisition. In later stages, recall yielded results approaching matching, whereas the anticipation procedure yielded overmatching of Rt anticipations and undermatching of R₂ anticipations. The results were interpreted as showing that as probability-ratio varies from .50-.50 to 1.00-0.00, and hence, as the relative difference of response strengths of S-R₁, and S-R₂ increases, the selection factor in the anticipation procedure yields a heavy weighting of the stronger response, R,, and the acquisition of the weaker association, S-R₂, occurs slowly; for the recall paradigm, however, the data suggest that R₁, is inhibited and S-R₂ is more readily acquired. The results also were interpreted as showing that one difference in the standard paired-associate recall and anticipation paradigms is that in the recall method. strong error tendencies may be inhibited, but in the anticipation method, strong error tendencies are weighted heavily.     

The More You See It, the More You Know It: Memory Accessibility and Sexual Harassment Judgments

The influence of the availability of personally known and media known sexual harassment victims and harassers on perceptions of social sexual workplace conduct was examined. Male and female full-time workers evaluated two videotapes that depict sexual harassment in the workplace. Results indicated that perceived likelihood of harassment and discrimination increased as participants recalled more examples of harassment victims whom they personally knew. In some instances, recall of victims in the media had a similar influence. As predicted, the influence of availability was stronger for men than for women. Similar findings resulted from the analyses of the unwelcomeness, severity, and pervasiveness of the conduct; however, legal standard, gender, or case often moderated this relationship. The implications of these findings are discussed.     

Interpreting ambiguous stimuli: Separating perceptual and judgmental biases

Interpreting ambiguous situations is not a purely data-driven process but can be biased towards positive interpretations by top-down influences. The present study tries to identify the underlying processes of these top-down influences. There are two separable types of processes that can be influenced by motivational biases: A perceptual bias affects information uptake whereas a judgmental bias affects acceptance criteria for positive and negative outcomes. In the present study, motivated influences on perception and judgment were investigated with a simple color discrimination task in which ambiguous stimuli had to be classified according to their dominating color. One of two colors indicated a financial gain or a loss, whereas a third color was neutral. To separate perceptual and judgmental biases, Ratcliff’s [Ratcliff, R. (1978). A theory of memory retrieval. Psychological Review, 85, 59–108] diffusion model was employed. Results revealed motivational influences on perception and judgment.     

A hierarchical investigation of personality and behavior: Examining Neo-Socioanalytic models of health-related outcomes

Based on proposed hierarchical relations derived from the Neo-Socioanalytic Theory of personality [Roberts, B. W., & Wood, D. (2006). Personality development in the context of the Neo-Socioanalytic Model of personality. In D. K. Mroczek & T. D. Little (Eds.), Handbook of personality development (pp. 11–39). Mahwah, NJ: Lawrence Erlbaum Associates Publishers], the present study examined the relationships between trait and motivation constructs and health-related outcomes. Participants (N = 201) completed a Big Five measure of personality traits, parallel exercise and diet behavioral identity trait measures, measures of personal values, exercise and diet-related personal strivings, and exercise and diet self-reports. Participants also completed a physical activity assessment and were weighed on a calibrated electronic scale from which body fat percentage could be determined. It was expected that contextualized trait and motivation constructs would mediate the relations between broad trait and motivation constructs and the health-related outcomes. The patterns of relations across trait and motivation constructs also were explored. The trait domain exhibited the expected pattern of hierarchical relations, but the motivation domain showed a more complex pattern of relations. The results are discussed in relation to a hierarchical model of personality and behavior that brings together trait and motivation constructs at multiple levels of analysis.     

Investigating the Awareness of Remembering

ABSTRACT— There is a marked lack of consensus concerning the best way to learn how conscious experiences arise. In this article, we advocate for scientific approaches that attempt to bring together four types of phenomena and their corresponding theoretical accounts: behavioral acts, cognitive events, neural events, and subjective experience. We propose that the key challenge is to comprehensively specify the relationships among these four facets of the problem of understanding consciousness without excluding any facet. Although other perspectives on consciousness can also be informative, combining these four perspectives could lead to significant progress in explaining a conscious experience such as remembering. We summarize some relevant findings from cognitive neuroscience investigations of the conscious experience of memory retrieval and of memory behaviors that transpire in the absence of the awareness of remembering. These examples illustrate suitable scientific strategies for making progress in understanding consciousness by developing and testing theories that connect the behavioral expression of recall and recognition, the requisite cognitive transactions, the neural events that make remembering possible, and the awareness of remembering.