PSYCHOMETRIC ANALYSIS OF THE VISUAL FORM DISCRIMINATION TEST
- Scalar effects in the visual discrimination of numerosity by pigeons. Emmerton, Jacky; Renner, Jennifer C. // Learning & Behavior;May2006, Vol. 34 Issue 2, p176
Pigeons trained in a conditional discrimination procedure to respond to a visual array made a left or right choice, depending on which of two numbers of elements (i.e., anchor numerosities) the array contained. They were then tested with novel arrays at these anchor numerusities, as well as at...
- RELIABILITY AND VALIDITY OF SCORES ON THE SLOSSON VISUAL PERCEPTUAL SKILL SCREENER. Erford, Bradley T.; Snyder, Henry // Perceptual & Motor Skills;Oct2004, Vol. 99 Issue 2, p621
Psychometric characteristics of the Slosson Visual Perceptual Skill Screener were studied using three independent samples of 595 boys and 578 girls ages 5 to 10 years. Adequate characteristics for item selection were indicated by item difficulty (Mdn = .49) and item discrimination (Mdii = .59)....
- Rotation or Reversal? A Proposed Definition. Poteet, James A. // Exceptional Children;Summer1968, Vol. 34 Issue 10, p760
The article provides information on the terms "rotation" and "reversal." These terms are used to describe the disturbance in visual perception observed on a copying task such as that presented by the Bender-Gestalt Test. The author suggests that most studies regarding this area did not provide...
- Visual Marking: Selective Attention to Asynchronous Temporal Groups. Yuhong Jiang; Chun, Marvin M.; Marks, Lawrence E. // Journal of Experimental Psychology. Human Perception & Performan;Jun2002, Vol. 28 Issue 3, p717
Examines the mechanisms of visual marking. Significance of perceptual segregation through asynchronous grouping to visual marking; Relation between selective attention and marking; Implications of inhibitions of previewed locations to visual marking in static displays.
- Sensory effects on judgments of short time-intervals. Grondin, Simon; Meilleur-Wells, Ginette; Ouellette, Claude; Macar, Francoise // Psychological Research;1998, Vol. 61 Issue 4, p261
Abstract Two experiments were conducted to test the effect of nontemporal factors on duration discrimination. In Exp. 1, a forced-choice adaptive procedure with a standard duration of 400 or 800 ms was employed. It was shown that, for both auditory and visual modes, the discrimination is better...
- Mental rotation and mirror-image discrimination. Pierret, Anne; Peronnet, Franck // Perceptual & Motor Skills;Apr94, Vol. 78 Issue 2, p515
Describes two experiments involving judgments of same-different to assess conditions in which mental rotation is used. Use of polygons and their mirror-image; Distinction of the polygon from its mirror-image; Patterns of reaction times.
- Visual filtering and covert orienting in persons with Down syndrome. Randolph, Beth; Burack, Jacob A. // International Journal of Behavioral Development;Jun2000, Vol. 24 Issue 2, p167
A forced-choice reaction time (RT) task was used to examine the efficiency of visual filtering (the inhibition of processing of irrelevant stimuli) and covert orienting (shifts of visual attention independent of eye movement) components of attention in persons with Down syndrome (n=20) and...
- Diurnal pattern of luminance discrimination in humans. Tassi, P.; Pellerin, N. // Perceptual & Motor Skills;Oct99, Vol. 89 Issue 2, p626
Investigates whether the human visual system displays a diurnal fluctuation of sensitivity by measuring the visual detection threshold every two hours over the diurnal period. Detection threshold as the dimmest visual stimulus that can be reliably detected; Resolution of the power of the visual...
- The time course of learning a visual skill. Karni, Avi; Sagi, Dov // Nature;9/16/1993, Vol. 365 Issue 6443, p250
Reports on the stability of performance within training sessions excluding the fast saturating improvement in the first practice. Permanent neural changes triggered by perceptual experience; Discrimination of visual stimuli; Time course of discrimination learning.