Intelligence,creativity, and performance abilities of EMR pupils

This study examined the relationships between intelligence, creativity, and the performance of EMR pupils as rated by their teachers. For this group of 217 subjects, equally distributed among black, white, male, and female, creativity appears to be as important as intelligence, or more so, in determining their rated performance scores.     

CT demonstration of caput medusae

Maximum intensity and volume rendered CT displays of caput medusae are provided to demonstrate both the anatomy and physiology of this portosystemic shunt associated with portal hypertension. Anat Sci Educ 2:184–185, 2009. © 2009 American Association of Anatomists.     

Acquisition and extinction of differential responses to signals paired with shock or shock omission in goldfish: Evidence for truly discriminated avoidance learning

Goldfish trained to discriminate between signals paired with shock (S?) and signals paired with shock omission (S+) with a linear presentation procedure, originally learned (OL) to control the signal state of a shuttle box and showed a decided preference for the S+ signal. In Experiment 1, following OL, groups had one OL signal replaced (S+ or S?), both signals replaced (S+ and S?), or the OL signals reversed (S+ and S? reversed) and were then tested in a transfer training procedure. In transfer, groups with one signal replaced maintained discriminated performance at OL levels; the S+ replaced group was slightly superior to the S? replaced group on the first day of transfer. With both OL signals replaced, discrimination dropped to chance performance levels, whereas, with OL signal shock pairing reversed, discrimination performance dropped below chance levels. In Experiment 2, following OL, extinction procedures consisted of turning off the shocker (0% shock) or of shocking 100% or a random 25% of the trials. A fourth extinction procedure (R,) retained the trial start response-dependent shock-omission contingency, but shock differentiating the S+ and S? signals was eliminated entirely. Extinction of the S+/S? discrimination was measured both during extinction training per se and with reversal retraining of the S+/S? discrimination later. Groups for which the OL S+ was paired with shock during extinction extinguished on both measures, but groups for which the OL S? was paired with shock omission did not extinguish, especially as shown by the reversal test procedure. Theoretical implications and the implications for several conditioning procedures are discussed.     

Peer perceptions of students receiving pull-out services in elementary school: A multi-age study

This study examined the peer nominations of 213 children in Kindergarten (90), 3rd grade (58), and 5th grade (65) to examine their perceptions of peers who received pull-out services for unique needs. Using Coie, Dodge, and Coppotelli’s[1982. “Dimensions and Types of Social Status: A Cross-age Perspective.” Developmental Psychology 18 (4): 557–570] protocol for assessing sociometric status in children, the results revealed that peer perceptions of most liked (ML) and least liked (LL) in the classroom were associated with pull-out status, with those students who did not receive pull-out services receiving more nominations as ML than their peers who did leave the classroom for pull-out services. Social impact scores for children who received pull-out services were not significantly different from those of children who did not receive pull-out services, but significant differences were revealed for social preference scores. Implications and avenues for future research are discussed.     

A Conceptual Framework for Organizing Active Learning Experiences in Biology Instruction

Introductory biology courses form a cornerstone of undergraduate instruction. However, the predominantly used lecture approach fails to produce higher-order biology learning. Research shows that active learning strategies can increase student learning, yet few biology instructors use all identified active learning strategies. In this paper, we present a framework to design biology instruction that incorporates all active learning strategies. We review active learning research in undergraduate biology courses, present a framework for organizing active learning strategies, and provide clear implications and future research for designing instruction in introductory undergraduate biology courses.     

Tilted post arrays for separating long DNA

Recent simulations by Chen and Dorfman [Electrophoresis 35, 405–411 (2014)] suggested that “tilting” the electric field with respect to the lattice vectors of a hexagonal post array would lead to a substantial improvement in electrophoretic DNA separations therein. We constructed such an array where the electric field is applied at an angle equidistant between the two lattice vectors. This tilted array leads to (i) baseline resolution of 20 kbp DNA and λ DNA (48.5 kbp) in a 4 mm channel and (ii) measurable separation resolutions for electric fields up to 50 V/cm, both of which are improvements over untilted post arrays of the same post density. The predicted time required to reach a resolution of unity is approximately 5 min, independent of electric field. The separations are more reproducible at higher fields.