Blocking between landmarks during 2-D (touchscreen) and 3-D (ARENA) search tasks with pigeons

Many studies investigating cue competition have focused on the blocking effect. We investigated the blocking effect with pigeons using a landmark-based spatial search task in both a touchscreen preparation (Exp. 1a) and an automated remote environmental navigation apparatus (Exp. 1b). In Phase 1, two landmarks (LMs: A and Z) appeared on separate trials as colored circles among a row of eight (touchscreen) or six (ARENA) identical response units. Subjects were rewarded for pecking at a target response unit to the right of LM A and to the left of an extraneous LM, Z. During the blocking trials in Phase 2, LM X was presented in compound with a second LM (A) that had been previously trained. On control trials, LM Y was presented in compound with LM B and a target in the same manner as in the trials of AX, except that neither landmark had previously been trained with the target. All subjects were then tested with separate trials of A, X, B, and Y. Testing revealed poor spatial control by X relative to A and Y. We report the first evidence for a spatial-blocking effect in pigeons and additional support for associative effects (e.g., blocking) occurring under similar conditions (e.g., training sessions, spatial relationships, etc.) in 3-D and 2-D search tasks.     

Where is it? How deaf adolescents complete fact-based internet search tasks

An exploratory study was designed to describe Internet search behaviors of deaf adolescents who used Internet search engines to complete fact-based search tasks. The study examined search behaviors of deaf high school students such as query formation, query modification, Web site identification, and Web site selection. Consisting of two fact-based search tasks, the study was done in four regional day school programs for the deaf. As students conducted two search tasks, they completed task analyses of the selected Web sites and gave reasons for their selections. The research also identified the processes used by deaf students to compensate for limited English reading abilities while navigating search engines results that were typically written well above deaf students' average reading level. The results demonstrated that deaf adolescents were unable to initiate, conduct, analyze, or validate effective Internet searches in response to fact-based search tasks.     

Using Gestalt theory to teach document design and graphics

Gestalt psychology principles of figure‐ground segregation, symmetry, closure, proximity, good continuation, and similarity provide a simple yet powerful analytic vocabulary for discussing page layout and graphics. The six principles apply readily to typography, white space, data tables and maps, the relation between graphics and text, and other facets of textual design. The principles explain many difficulties that readers have in processing texts and graphics, and they explain why well‐designed pages and graphics are effective.     

Diversity in deafness: Assessing students who are deaf or hard of hearing

The purpose of this article is to support members of a student's multidisciplinary team to identify complex factors involved in providing valid classroom-based assessment data, including issues surrounding technology-based assessment for students who are deaf or hard of hearing (DHH). The diversity of this population creates unique challenges in creating guidelines for assessment. An overview of the diversity of DHH students is used to provide a framework for examining current assessment practices, including both effective and ineffective practices. Cognitive and linguistic learning differences and diverse language learning experiences in the population are discussed as they relate to assessment protocols. Paralleling technology-based learning experiences with comparable technology-based assessment experiences is also presented. Recommendations for planning for accessible and meaningful assessment include the use of innovative technologies to align instruction and assessment.