The representation of uniform motion in vision

For veridical detection of object motion any moving detecting system must allocate motion appropriately between itself and objects in space. A model for such allocation is developed for simplified situations (points of light in uniform motion in a frontoparallel plane). It is proposed that motion of objects is registered and represented successively at four levels within frames of reference that are defined by the detectors themselves or by their movements. The four levels are referred to as retinocentric, orbitocentric, egocentric, and geocentric. Thus the retinocentric signal is combined with that for eye rotation to give an orbitocentric signal, and the left and right orbitocentric signals are combined to give an egocentric representation. Up to the egocentric level, motion representation is angular rather than three-dimensional. The egocentric signal is combined with signals for head and body movement and for egocentric distance to give a geocentric representation. It is argued that although motion perception is always geocentric, relevant registrations also occur at the three earlier levels. The model is applied to various veridical and nonveridical motion phenomena.     

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.     

Visual orientation during and after lateral head,body, and trunk tilt

Visual judgments of orientation were investigated during (effect) and after (aftereffect) different body postures. In Experiment 1 four trained Ss made apparent verticality (AV) judgments before and after 2 min in each of seven orientations: head tilt left and right, body tilt left and right, trunk tilt left and right and a control condition with head ’and body upright. The aftereffect was significant for all postures excepting trunk tilt left and the control. The aftereffect from head tilt was greater than that from the same degree of body tilt, and that in the trunk tilt condition was in the same direction as’ predicted from neck stimulation. In Experiment 2, 30 Ss made AV judgments during tilt in the same seven postures. The E-phenomenon resulted from both head and body tilts, and an effect was found for trunk tilt in the direction predicted from neck stimulation. The results are discussed in terms of the otolith, neck, and trunk receptor systems.     

A cross-cultural perspective on perceptions of paternalistic deficiencies in the United States: The myth of the derelict daddy

The image of the American father figure, as depicted by both the professional and the popular media, ranges from neutrality to one of a negative connotation: unavailable, aloof, inadequate, incompetent, fumbling. Empirical data from 18 cultures on adult-child proxemic interactions suggest that American fathers may be providing normative contact time and normative interaction with their children. The apparent inconsistency between the image and the behavior is examined. It is argued that the status-role complexes of primary child caretaker and of soldier are incompatible. Because males have been universally given the status of soldier, they cannot also be given the status of primary child caretaker. To prevent or reduce role conflict, the males are socialized to avoid internalizing the status of primary child caretaker. Once the symboling system is internalized, with the symbols of soldier and primary child caretaker discretely compartmentalized, then the actual behaviors can overlap considerably. The inconsistency of the image and the data is suggested to reflect a delicate societal charade which shields high levels of man-child interaction from social tampering.     

Assessing State Mental Contamination: Development and Preliminary Validation of the State Mental Contamination Scale

This 2-part study described the development and preliminary validation of the State Mental Contamination Scale (SMCS), a multi-item self-report measure of state mental contamination. In Study 1, community adults (N = 211) in the United States were randomly assigned to a pathogen disgust, moral disgust, or neutral condition and then completed the SMCS. Study 1 results supported a 1-factor structure of the SMCS items. Scores on the SMCS items evidenced good internal consistency and strong interitem correlations. SMCS scores were significantly greater following the 2 disgust conditions relative to the neutral condition and a full range of SMCS scores were found in the disgust conditions. An independent sample of community adults (N = 121) from the United States participated in Study 2 to extend Study 1 results. Study 2 results indicated that SMCS scores were manipulated independently of trait mental contamination, more strongly related to convergent than a discriminant measure, and shared unique variance with a criterion measure after controlling for convergent measures. The future use of the SMCS is discussed.     

Nano-Technology, Ethics, and Risks

Nanotechnology is developing far faster than our understanding of its effects. This lapping of our understanding by speedy development is typical of new technologies, and in the United States we let development occur, introducing new artifacts into the world, without any serious attempt to understand beforehand their effects, long-term or short-term. We have been willing to pay the price of pushing the technological envelope, but pushing the nanotechnological envelope has some special risks, requiring more caution.