We define and describe how subitizing activity develops and relates to early quantifiers in mathematics. Subitizing is the direct perceptual apprehension and identification of the numerosity of a small group of items. Although subitizing is too often a neglected quantifier in educational practice, it has been extensively studied as a critical…

Discusses the size-weight illusion that occurs when a person lifts two equal-weight objects differing in size and perceives the larger object as lighter than the small object. Describes several inexpensive techniques for demonstrating the size-weight illusion and reviews some relevant issues concerning this phenomena. (MJP)

Investigates the role active, self-produced movement might play in the type of rotation task typically used to assess spatial orientation in children 12 months to 18 months of age. Results indicated that, at least at 12 months, spatial orientation was indeed facilitated by allowing the infants (n = 13) to move through space on their own. (RH)

Explains the hierarchic structure of the mammalian visual system. Proposes a model in which feedback pathways serve to modify sensory stimuli in ways that enhance and complete sensory input patterns. Investigates the functioning of the system through computer simulations. (ML)

Investigates preschool children's ability (n = 30) to discriminate age, and subject's use of different facial areas in ranking facial photographs into age order. Results indicate subjects from 3 to 9 years can successfully rank the photos. Compared with other facial features, the eye region was most important for success in the age ranking task.…

Describes subjective-contour illusions and gives explanations for perception of shape and brightness in these figures. Supports cognitive mechanisms rather than psychological mechanisms. Gives examples of subjective-contour illusions and summarizes explanations of other psychologists with regard to this topic. (CW)

Results of three experiments support the generalization that early perception of object unity depends on perceived motion, and that the class of effective motions includes, at least, the rigid translations of an object in three-dimensional space. Effective motions may be specified by very different sources of stimulus information. (RH)

Meanings given to the term "perception" are discussed in this paper and two categories of perception theories having implications for instructional media research are identified. One category is described as extroverted because it includes theories primarily concerned with characteristics of external stimuli and the influence that the…

Four experiments assessed converging aspects of four-month-old infants' perceptions of visual patterns. Results together corroborate and extend previous findings that vertical symmetry has a special status in early perceptual development and that infants can perceive pattern wholes. (Author/AS)

This study examined the effects of the cochlear hearing loss of 12 adults on two measures of sequential processing that rely on spectro-temporal information: a gap-detection discrimination task and a melody recognition task. It was concluded that cochlear hearing loss deleteriously affects the processes underlying perceptual organization of…

Argues that pointing emerges as a component of action-for-self: selective orienting to salient (usually moving or changing things). Pointing with vocalization, followed by pointing with naming, indexes the child's shifting focus of attention. Evidence that pointing emerges for the purpose of intentional communication is lacking. (Author/CB)

The processing of mental structures in perception appears to be serial, in that viewers can fill in missing parts from an impoverished stimulus following a top down process. To investigate the effects of unfamiliarity, complexity, and legibility on object and layout perception of unfamiliar stimuli, ten subjects were shown one of four ribbon…

While researchers have made progress in understanding metaphor comprehension, less is known about the production of metaphoric language. College students (N=129) were asked to use metaphoric comparisons to describe 16 topics. They were told to imagine themselves on a trip, writing home to someone they knew well, either a peer or a child (students…

This study examined the abilities of 18 adults with familial dyslexia to use steady state, dynamic, and temporal cues in synthetic speech continua. Although subjects were able to label and discriminate the continua, they did not necessarily use acoustic cues in the same manner as did normal readers, and their overall performance was less accurate.…

Successful outcome in psychotherapy depends, in part, on clients' preconceptions and expectations. Research has shown that inaccurate expectations are more prevalent among lower socioeconomic status clients, who also represent the majority of substance abusers in community treatment programs. To investigate the effect of general and specific…