Testing for the Inclusion of Variables in Einear Regression by a Randomisation Technique

A randomisation procedure is given for making tests on the coefficients of regression equations developed from data which arise from a general multivariate distribution, not necessarily Normal. The procedure makes use of a six card computer subroutine which randomly permutes an array of numbers. This subroutine is extremely useful and can be employed in many other types of problems.     

Immediate and long-term recognition and generalization of advertised products as a function of age and presentation mode.

Examined 30 preschoolers' (aged 3–5 yrs), 30 kindergartners', and 30 2nd graders' immediate and long-term recognition memory for advertised products following an audio, video, or audiovisual presentation of commercials. A 3?×?3 factorial design was employed, with presentation mode (visual only, auditory only, and combined auditory and visual) and age of S as the factors. Ss recognized advertised products more often following exposure to visual or audiovisual commercial presentations than to auditory presentations. Age differences were detected for immediate and long-term product recognition. An errors analysis revealed that Ss of all 3 ages reported being exposed to nonadvertised foods that were members of the same class as the advertised products more frequently than would have been expected by chance. Findings are discussed in terms of the generalized effects of children's TV advertising. (20 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

ARDEA—An MAV with skills for future planetary missions

We introduce a prototype flying platform for planetary exploration: autonomous robot design for extraterrestrial applications (ARDEA). Communication with unmanned missions beyond Earth orbit suffers from time delay, thus a key criterion for robotic exploration is a robot's ability to perform tasks without human intervention. For autonomous operation, all computations should be done on‐board and Global Navigation Satellite System (GNSS) should not be relied on for navigation purposes. Given these objectives ARDEA is equipped with two pairs of wide‐angle stereo cameras and an inertial measurement unit (IMU) for robust visual‐inertial navigation and time‐efficient, omni‐directional 3D mapping. The four cameras cover a $240^{°}$ vertical field of view, enabling the system to operate in confined environments such as caves formed by lava tubes. The captured images are split into several pinhole cameras, which are used for simultaneously running visual odometries. The stereo output is used for simultaneous localization and mapping, 3D map generation and collision‐free motion planning. To operate the vehicle efficiently for a variety of missions, ARDEA's capabilities have been modularized into skills which can be assembled to fulfill a mission's objectives. These skills are defined generically so that they are independent of the robot configuration, making the approach suitable for different heterogeneous robotic teams. The diverse skill set also makes the micro aerial vehicle (MAV) useful for any task where autonomous exploration is needed. For example terrestrial search and rescue missions where visual navigation in GNSS‐denied indoor environments is crucial, such as partially collapsed man‐made structures like buildings or tunnels. We have demonstrated the robustness of our system in indoor and outdoor field tests.     

Role relationships and behavior between preschool-aged and school-aged sibling pairs.

18 2.5–6.5 yr old and 18 7–9 yr old White sibling pairs were observed in their homes and yards while engaged in unstructured naturalistic activities. Each observation session lasted 35 min, and each child's behavior was coded separately. Roles were operationalized and observed as follows: teacher, learner, manager, managee, helper, helpee, and observer. Analyses showed that older siblings across both age groups assumed the manager and helper roles more often than their younger siblings, while younger siblings assumed the observer, managee, and helpee roles more often. School-aged female siblings directed more prosocial behavior toward one another than any other age group/gender combination. Preschool-aged male siblings directed more agonistic behavior toward one another than any other combination. Older school-aged females assumed the teacher role more often than any other older siblings, and younger school-aged females assumed the learner role more often than any other younger siblings. These results held even when an analysis that controlled for differences in interaction rates was performed, with 1 exception: Female siblings of school age directed more prosocial behavior to one another than did school-aged male siblings. (10 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Ecology and population status of Trout-perch (Percopsis omiscomaycus) in western Lake Erie

Trout-perch Percopsis omiscomaycus is among the most abundant benthic species in Lake Erie, but comparatively little is known about its ecology. Although others have conducted extensive studies on trout-perch ecology, those efforts predated invasions of white perch Morone americana, Dreissena spp., Bythotrephes longimanus and round goby Neogobius melanostomus, suggesting the need to revisit past work. Trout-perch were sampled with bottom trawls at 56 sites during June and September 2010. We examined diets, fecundity, average annual mortality, sex ratio, and long-term population trends at sites sampled since 1961. Trout-perch abundance fluctuated periodically, with distinct shorter- (4-year) and longer-term (over period of 50 years) fluctuations. Males had higher average annual mortality than females. Both sexes were equally abundant at age 0, but females outnumbered males 4:1 by age 2. Diets of trout-perch were dominated by macroinvertebrates, particularly chironomids and Hexagenia sp. Size distributions of trout-perch eggs varied widely and exhibited multiple modes indicative of protracted batch spawning. A review of the few other studies of trout-perch revealed periodic fluctuations in sex ratio of adults, which in light of our evidence of periodicity in abundance suggests the potential for sex-ratio-mediated intrinsic population regulation. Despite the introduction of numerous invasive species in Lake Erie, trout-perch remain one of the most abundant benthic invertivores and the population is relatively stable.     

Peers as mediators of television food advertisements aimed at children.

Past research on the effects of TV has focused primarily on it as a unitary force rather than as 1 source of influence in a network of cross-pressures. The present study attempted to determine how peer-modeled food preferences combined with TV food commercials to influence the food preferences of school-aged children. 40 Black and 40 White 4th graders were assigned randomly to 1 of 4 conditions: TV control, TV advertisements with similar peer-modeled food preferences, and TV advertisements with dissimilar peer-modeled food preferences. An additional 40 children served as peer models. Ss in the TV advertisement condition preferred foods in the same class as the advertised foods more frequently than did Ss in the TV control condition. Ss in the TV advertisement/peer-similar condition preferred foods like the advertised food more often than Ss in the TV advertisement condition, whereas Ss in the TV/peer-dissimilar condition preferred foods like the advertised food less frequently than did Ss in the TV advertisement condition. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Development and Experimental Testing of an Optical Micro-Spectroscopic Technique Incorporating True Line-Scan Excitation

Multiphoton micro-spectroscopy, employing diffraction optics and electron-multiplying CCD (EMCCD) cameras, is a suitable method for determining protein complex stoichiometry, quaternary structure, and spatial distribution in living cells using Förster resonance energy transfer (FRET) imaging. The method provides highly resolved spectra of molecules or molecular complexes at each image pixel, and it does so on a timescale shorter than that of molecular diffusion, which scrambles the spectral information. Acquisition of an entire spectrally resolved image, however, is slower than that of broad-bandwidth microscopes because it takes longer times to collect the same number of photons at each emission wavelength as in a broad bandwidth. Here, we demonstrate an optical micro-spectroscopic scheme that employs a laser beam shaped into a line to excite in parallel multiple sample voxels. The method presents dramatically increased sensitivity and/or acquisition speed and, at the same time, has excellent spatial and spectral resolution, similar to point-scan configurations. When applied to FRET imaging using an oligomeric FRET construct expressed in living cells and consisting of a FRET acceptor linked to three donors, the technique based on line-shaped excitation provides higher accuracy compared to the point-scan approach, and it reduces artifacts caused by photobleaching and other undesired photophysical effects.