Implications of measurement of eye fixations for a psychophysics of form perception

It was suggested that insights into feature analysis of processes involved in form identification might be gained from an analysis of eye movements made by Ss as they identified patterns. Fixations were measured during identifications of histoforms, polygons, and Vargus 10 figures. Eye fixations were measured, and Ss rated sections of the figures in terms of their importance. Eye fixations were measured in terms of number of changes and duration of fixations. The number of changes in fixation were found to reflect only individual differences. Duration of fixation was found to vary significantly with location within figures, with fixations being longest where changes of contour occurred. There was also a tendency to look longer at the top of polygons and Vargus 10 figures and at the center of histoforms. Ratings of importance were highest for sections of figures fixated for longer duration-generally areas in which changes of contour were present.     

Retrieval processes in recall

A reaction time (RT) paradigm was developed to study retrieval processes in paired associate (PA) recall. Prior to the experimental session, subjects learned lists of PAs (varying in length from three to 24 pairs); during the experimental session, subjects' RT to say the response word from the onset of a visually presented stimulus word was measured. The implications of several classes of retrieval models were discussed in the context of this paradigm. The shape of the RT-list length function, practice, and sequential effects were all of interest in distinguishing among models. Four experiments were reported which were designed to (1) establish the baseline effects in this paradigm, (2) determine which of these effects should be attributed to the retrieval stage of processing, and (3) investigate the effect of semantic memory in this task. Results suggest that simple serial scanning models are inadequate to handle the data from this task. Strength, direct-access, or parallel processing models, on the other hand, seem to capture the qualitative effects present in our experiments. When a strength model was formalized and fit to the data from Experiment I, it was found that a two-trace version gave good quantitative fits while a one-trace version did not, suggesting that both short- and long-term memory independently contribute in this task.     

Motivation concepts and sexual identity

The association dimension of the Picture Identification Test (PIT) was used to investigate the motivation concepts of male and female university students classified as Declared Homosexual, Sexually Uncertain, Clinical Control, and Normal Control. The t test was used to identify Need Association Dyads which discriminated (p < .01) groups. Greater than chance numbers of variables discriminated each of the pairs of groups within each sex except the Sexually Uncertain versus Clinical Control Male groups, the Declared Homosexual versus Clinical Control Female groups, and the Declared Homosexual versus Normal Control Female groups. PIT Need Association Dyads were discussed as a type of implicit personality theory assessment with emphasis on the beliefs subjects hold about the simultaneous expression of needs.     

What’s up in mental rotation?

We report two experiments on the influence of head tilt on mental rotation. In Experiment I, subjects decided whether dot patterns were or were not repeated about a line. Their reaction times (RTs) were consistent with the interpretation that they mentally rotated the patterns so that the line was subjectively vertical before making their decisions. When the subjects tilted their heads, the RT functions shifted in the direction of the tilt, indicating that the subjective vertical lay closer to the retinal than to the gravitational vertical. In Experiment II, subjects decided whether singly presented alphanumeric characters in various orientations were standard or backward (mirror-reversed). Again, analysis of their RTs suggested mental rotation to the standard upright, but the function was unaffected by head tilt; in this case, the subjects operated in subjective gravitational rather than retinal coordinates. The choice of retinal or gravitational coordinates may depend on whether the stimuli are interpreted egocentrically or as part of the external world.     

Book Reviews

J oseph B. W heelwright (Ed): The analytic process: aims, analysis, training
A. A lvarez : The savage god
B ernard A aronson and H umphrey O smond (Eds.): Psychedelics: the uses and implications of hallucinogenic drugs
E rnst B ernhard : Mitobiografia
B arbara H annah : Striving towards wholeness
C raig R. E isendraht : The unifying moment: the psychological philosophy of William James and Alfred North Whitehead     

Visual interaction in a group of introverts and extraverts

Ten introverts and 10 extraverts were selected from a student population on the bask of their responses to the E.P.I. The groups contained 5 men and 5 women and were matched for Neuroticism. Each subject took part in two 4-minute conversations, one with a male confederate, one with a female confederate. The same two confederates were used throughout the experiment, and no attempt was made to programme any aspect of their behaviour. Two trained observers, who sat behind a one way screen situated close to the speakers, recorded the visual and speech behaviour of both subject and confederate by means of a four-channel event-recorder. The recordings were made for the last 3 minutes of each interaction. Extraverts Looked more frequently than introverts, but there were no differences between the two groups in the proportions of time spent in Looking and eye-contact, or in the mean length of Looks. Extraverts also spoke more frequently than introverts, a finding which may complement that for the number of Looks. The findings could not be explained by the behaviour of the confederates, since they behaved consistently across the two groups of subjects. The experiment is discussed with particular reference to Mobbs (1968) and Kendon and Cook (1969). Comparisons of methodology are made.     

A HULLIAN CONSTANT AS AN INDEX OF INTELLIGENCE: TWO EMPIRICAL INVESTIGATIONS

Following Clark Hull, it is widely considered that the asymptote of the learning curve represents motivational factors, but that rate of approach to asymptote ('i') represents associational factors. The suggestion that i may be a measure of intelligence was tested empirically in two studies. An initial exploratory study yielded a positive correlation between i and IQ. A more rigorous replication did not. The results are discussed briefly.     

Psychoanalytically oriented short-term groups for outpatients: Unsettled issues

The psychoanalytic approach to short-term group therapy for outpatients has been less prevalent than other approaches. Unsettled issues associated with this approach concern the feasibility of carrying out psychoanalytic work on an ongoing basis, patient selection, group composition, patient preparation, therapist technique, and cotherapy. Recent literature relevant to a conceptual consideration of these issues is reviewed. A vignette from a recent therapy group is presented as part of a clinical consideration of the issues. In addition, practical suggestions for conducting such groups are provided.This article was derived from a paper presented at the Seventh Annual Meeting of the Canadian Group Psychotherapy Association, October 16, 1986, Mont Tremblant, Canada.     

“Higher” and “lower”: Comparative and categorical interpretations by children

Three-, four-, and five-year-old children's categorical and comparative understanding of high and low were examined in two experiments. Categorical knowledge was assessed by presenting subjects with a single object at varying heights (from 0 to five feet above the ground), and asking if the object was high or low. Comparative understanding of the terms was assessed by showing children two objects at a time and asking which was higher or lower. We observed two patterns of performance in children's categorical treatments: younger children in particular defined disjoint categories for high and low such that they only labelled the extreme heights as high or low, and maintained that middle heights were neither high nor low. Older children defined either-or categories such that all heights were labelled either high or low. We also found that children who defined either-or categories made correct comparative judgments across the entire range of variation whereas children who defined disjoint categories could only judge which of two objects was higher if the objects were not low (at 0 and 1 feet) and which of the objects was lower if the objects were not high (at 4 and 5 feet). The results were interpreted as reflecting a lack of appreciation that the terms are interdefined as negations of each other, and were discussed in terms of the similar semantic-congruity effects found in adults.