329 research outputs found

    The creation of autism

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    Bonnie Evans on how autism became such an important psychological concep

    Legacies transforming memories into memorials

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    The Relationship between Event-Based Prospective Memory and Ongoing Task Performance in Chimpanzees (Pan troglodytes)

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    Prospective memory is remembering to do something at a future time. A growing body of research supports that prospective memory may exist in nonhuman animals, but the methods used to test nonhuman prospective memory differ from those used with humans. The current work tests prospective memory in chimpanzees using a method that closely approximates a typical human paradigm. In these experiments, the prospective memory cue was embedded within an ongoing task. Tokens representing food items could be used in one of two ways: in a matching task with pictures of items (the ongoing task) or to request a food item hidden in a different location at the beginning of the trial. Chimpanzees had to disengage from the ongoing task in order to use the appropriate token to obtain a higher preference food item. In Experiment 1, chimpanzees effectively matched tokens to pictures, when appropriate, and disengaged from the ongoing task when the token matched the hidden item. In Experiment 2, performance did not differ when the target item was either hidden or visible. This suggested no effect of cognitive load on either the prospective memory task or the ongoing task, but performance was near ceiling, which may have contributed to this outcome. In Experiment 3, we created a more challenging version of the task. More errors on the matching task occurred before the prospective memory had been carried out, and this difference seemed to be limited to the hidden condition. This finding parallels results from human studies and suggests that working memory load and prospective memory may have a similar relationship in nonhuman primates

    Do Social Conditions Affect Capuchin Monkeys’ (Cebus apella) Choices in a Quantity Judgment Task?

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    Beran et al. (2012) reported that capuchin monkeys closely matched the performance of humans in a quantity judgment test in which information was incomplete but a judgment still had to be made. In each test session, subjects first made quantity judgments between two known options. Then, they made choices where only one option was visible. Both humans and capuchin monkeyswere guided by past outcomes, as they shifted from selecting a known option to selecting an unknown option at the point at which the known option went from being more than the average rate of return to less than the average rate of return from earlier choices in the test session. Here, we expanded this assessment of what guides quantity judgment choice behavior in the face of incomplete information to include manipulations to the unselected quantity.We manipulated the unchosen set in two ways: first, we showed the monkeys what they did not get (the unchosen set), anticipating that “losses” would weigh heavily on subsequent trials in which the same known quantity was presented. Second, we sometimes gave the unchosen set to another monkey, anticipating that this social manipulation might influence the risk-taking responses of the focal monkey when faced with incomplete information. However, neither manipulation caused difficulty for the monkeys who instead continued to use the rational strategy of choosing known sets when they were as large as or larger than the average rate of return in the session, and choosing the unknown (riskier) set when the known set was not sufficiently large. As in past experiments, this was true across a variety of daily ranges of quantities, indicating that monkeys were not using some absolute quantity as a threshold for selecting (or not) the known set, but instead continued to use the daily average rate of return to determine when to choose the known versus the unknown quantity

    How Is Chimpanzee Self-Control Influenced by Social Setting?

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    Self-control is often required in natural situations involving interactions with other individuals, and personal self-control can be compromised if other individuals act impulsively. In this study, we tested self-control in pairs of chimpanzees in a variety of settings where at least one chimpanzee of each pair performed an established test for self-control in which candies accumulated one at time as long as the chimpanzee did not eat any of them. When tested alone, some chimpanzees exhibited greater self-control as compared to when tested alongside a chimpanzee that independently performed the same type of test. However, when the nonfocal animal freely consumed rewards while the focal chimpanzee performed the accumulation task, the self-control of some focal chimpanzees was elevated as compared to when working alone. Finally, when the focal and nonfocal animals worked jointly on the same test and the number of rewards accumulated was dependent on both animals’ continued ability to inhibit eating the items, chimpanzees performed the same when housed together or in adjacent enclosures. On the whole, the effects of social setting were modest, but these results may relate to the literature on vicarious depletion of self-control, and they present interesting avenues for future research

    ‘WA 64’ Apple

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    ‘WA 64’ (‘Honeycrisp’ × ‘Cripps Pink’) is a new apple selection from the Washington State University apple breeding program with commercial potential based on its exceptional eating quality, attractive appearance, and storage potential. It is a medium-sized, attractive bicolored apple with a red/pink blush over a green/yellow background. It has outstanding eating quality, being firm, crisp, and tasty. Fruit matures in ‘Golden Delicious’ season, typically mid-September in Wenatchee, WA, USA. It retains fruit quality, particularly firmness, after several months in refrigerated storage. It is suited to the fresh market with the potential to be a commercial cultivar suited for long-term storage. Slow browning flesh is a bonus for this selection

    The Vehicle, 1967, Vol. 9 no. 2

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    Table of Contents Commentarypage 3 SketchAnn Butlerpage 4 I Take A Long-Out-of-Use BookAnthony Griggspage 5 The Leaf StemDianne Cochranpage 6 The Four MusketeersJim Courterpage 7 Status QuoAdrian Beardpage 7 SketchAnn Butlerpage 8 NocturneMike Baldwinpage 9 Oh Impatient HeartK. H. Shariffpage 9 Letter to a FianceeMaurice Snivelypage 10 Listen!Bonnie Blackpage 11 The Water\u27s EdgeStephen W. Gibbspage 12 TogetherDavid Reifpage 13 SketchAnn Butlerpage 14 Evening TimeSharon Nelsonpage 15 Japanese HaikuBev Hensonpage 15 Of Love and WarBruce Czeluscinskipage 16 Always AloneKib Voorheespage 17 the end of loveJackie Bratcherpage 18 1-20-66Sharon Nelsonpage 19 Blessed Are WeBonnie Marie Beckpage 19 The Time To LiveNeil Tracypage 20 Imminent AwakeningHelen Coxpage 21 The Dead Panther LairMolly J. Evanspage 21 Good SheepMike Tilfordpage 22 The Flame of LifeJacki Jacquespage 23 Then Arrives The Day Of DarkMolly J. Evanspage 23 Sketch: To love is to rememberAnn Butlerpage 24 Hidden RiversCharles J. Mertzpage 25 SilenceLinda G. Phillipspage 26 December - 1964Bonnie Blackpage 26 LoveHazel Thomaspage 27 To Praise A Good Man Neil Tracypage 28 Definitions \u2767Sharon Nelsonpage 29 To Wish Is a CrimeBonnie Marie Beckpage 30 College MadhatterMaurice Snivelypage 31 No. 8Sharon Nelsonpage 32 The Open FireSusan Williamspage 32https://thekeep.eiu.edu/vehicle/1017/thumbnail.jp

    Deep soil water-use determines the yield benefit of long-cycle wheat

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    Wheat production in southern Australia is reliant on autumn (April-May) rainfall to germinate seeds and allow timely establishment. Reliance on autumn rainfall can be removed by sowing earlier than currently practiced and using late summer and early autumn rainfall to establish crops, but this requires slower developing cultivars to match life-cycle to seasonal conditions. While slow-developing wheat cultivars sown early in the sowing window (long-cycle), have in some cases increased yield in comparison to the more commonly grown fast-developing cultivars sown later (short-cycle), the yield response is variable between environments. In irrigated wheat in the sub-tropics, the variable response has been linked to ability to withstand water stress, but the mechanism behind this is unknown. We compared short- vs. long-cycle cultivars × time of sowing combinations over four seasons (2011, 2012, 2015, and 2016) at Temora, NSW, Australia. Two seasons (2011 and 2012) had above average summer fallow (December-March) rain, and two seasons had below average summer fallow rain (2015 and 2016). Initial plant available water in each season was 104, 91, 28, and 27 mm, respectively. Rainfall in the 30 days prior to flowering (approximating the critical period for yield determination) in each year was 8, 6, 14, and 190 mm, respectively. We only observed a yield benefit in long-cycle treatments in 2011 and 2012 seasons where there was (i) soil water stored at depth (ii) little rain during the critical period. The higher yield of long-cycle treatments could be attributed to greater deep soil water extraction (<1.0 m), dry-matter production and grain number. In 2015, there was little rain during the critical period, no water stored at depth and no difference between treatments. In 2016, high in-crop rainfall filled the soil profile, but high rainfall during the critical period removed crop reliance on deep water, and yields were equivalent. A simulation study extended our findings to demonstrate a median yield benefit in long-cycle treatments when the volume of starting soil water was increased. This work reveals environmental conditions that can be used to quantify the frequency of circumstances where long-cycle wheat will provide a yield advantage over current practice.The research undertaken as part of this project is made possible by the significant contributions of growers through both trial cooperation and the support of the GRDC (projects CSP00111, CSP00178, CSP00183, 9175069, and a GRDC Grains Industry Research Scholarship
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