scholarly journals Echolocating bats can adjust sensory acquisition based on internal cues

BMC Biology ◽  
2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Arjan Boonman ◽  
Itai Rieger ◽  
Eran Amichai ◽  
Stefan Greif ◽  
Ofri Eitan ◽  
...  
Keyword(s):  
Doppler Shift ◽  
Real Life ◽  
External Input ◽  
Constant Frequency ◽  
Emission Frequency ◽  
In The Wild ◽  
Internal Information ◽  
Free Environment ◽  
Sensory Adaptations ◽  
Do So

Abstract Background Sensory systems acquire both external and internal information to guide behavior. Adjustments based on external input are much better documented and understood than internal-based sensory adaptations. When external input is not available, idiothetic—internal—cues become crucial for guiding behavior. Here, we take advantage of the rapid sensory adjustments exhibited by bats in order to study how animals rely on internal cues in the absence of external input. Constant frequency echolocating bats are renowned for their Doppler shift compensation response used to adjust their emission frequency in order to optimize sensing. Previous studies documented the importance of external echoes for this response. Results We show that the Doppler compensation system works even without external feedback. Bats experiencing accelerations in an echo-free environment exhibited an intact compensation response. Moreover, using on-board GPS tags on free-flying bats in the wild, we demonstrate that the ability to perform Doppler shift compensation response based on internal cues might be essential in real-life when echo feedback is not available. Conclusions We thus show an ecological need for using internal cues as well as an ability to do so. Our results illustrate the robustness of one particular sensory behavior; however, we suggest this ability to rely on different streams of information (i.e., internal or external) is probably relevant for many sensory behaviors.

scholarly journals Did the NSA and GCHQ Diminish Our Privacy? What the Control Account Should Say

2020 ◽  
Vol 7 (1) ◽  
pp. 29-48 ◽  
Author(s):  
Leonhard Menges
Keyword(s):  
Mobile Phone ◽  
Personal Information ◽  
Real Life ◽  
Mobile Phone Data ◽  
Standard Account ◽  
Do So

AbstractA standard account of privacy says that it is essentially a kind of control over personal information. Many privacy scholars have argued against this claim by relying on so-called threatened loss cases. In these cases, personal information about an agent is easily available to another person, but not accessed. Critics contend that control accounts have the implausible implication that the privacy of the relevant agent is diminished in threatened loss cases. Recently, threatened loss cases have become important because Edward Snowden’s revelation of how the NSA and GCHQ collected Internet and mobile phone data presents us with a gigantic, real-life threatened loss case. In this paper, I will defend the control account of privacy against the argument that is based on threatened loss cases. I will do so by developing a new version of the control account that implies that the agents’ privacy is not diminished in threatened loss cases.

Inactivation of the DSCF area of the auditory cortex with muscimol disrupts frequency discrimination in the mustached bat

1992 ◽  
Vol 68 (5) ◽  
pp. 1613-1623 ◽  
Author(s):  
H. Riquimaroux ◽  
S. J. Gaioni ◽  
N. Suga
Keyword(s):  
Auditory Cortex ◽  
Doppler Shift ◽  
Broad Band ◽  
Primary Auditory Cortex ◽  
Tone Burst ◽  
Signal Pulse ◽  
Gamma Aminobutyric Acid ◽  
Constant Frequency ◽  
Mustached Bat ◽  
Leg Flexion

1. The Jamaican mustached bat uses a biosonar signal (pulse) with eight major components: four harmonics each consisting of a long constant frequency (CF1-4) component followed by a short frequency-modulated (FM1-4) component. While flying, the bat adjusts the frequency of its pulse so as to maintain the CF2 of the Doppler-shifted echo at a frequency to which its cochlea is very sharply tuned. This Doppler shift (DS) compensation likely is mediated or influenced by the Doppler-shifted CF (DSCF) processing area of the primary auditory cortex, which only represents frequencies in the range of echo CF2s (60.6 to 62.3 kHz when the "resting" frequency of the CF2 is 61.0 kHz). 2. We trained four bats to discriminate between different trains of paired tone bursts that mimicked a bat's pulse CF2 and the accompanying echo CF2. The frequency of these CF2s ranged between 61.0 and 64.0 kHz. A discriminated shock avoidance procedure response was employed using a leg flexion. For one stimulus, the S+, the pulse and echo CF2s were the same frequency (delta f = 0, i.e., no Doppler shift). A leg flexion during the S+ turned off both the S+ and the scheduled shock. For a second stimulus, the S-, the echo CF2 was 0.05, 0.1, 0.3, 0.5, or 2.0 kHz higher than the pulse CF2. A delta f of 0.05 kHz was a frequency difference of 0.08%. No shock followed the S-, and leg flexions had no consequences. Correct responses consisted of a leg flexion during the S+ and no flexion during the S-; these responses were added together to compute the percentage of correct responses. When a bat correctly responded at better than 75% for all the delta f s, muscimol, a potent agonist of gamma-aminobutyric acid, was bilaterally applied to inactivate the DSCF area. Performance on each delta f discrimination was then measured. 3. Initial attempts to condition the bats to flex their legs to the CF tones mimicking part of the natural pulses and echoes failed. When broad-band noise bursts were substituted, however, the conditioned response was rapidly established. The noise band-width was gradually reduced and then replaced with the CF tones. Discrimination training with the tone burst trains then commenced. Throughout this procedure, the bats maintained their responding to the stimuli. The bats typically required approximately 20-30 sessions to perform consistently (> or = 75% correct responses) a discrimination involving a 2 kHz delta f.(ABSTRACT TRUNCATED AT 400 WORDS)

New Caledonian crows show behavioural flexibility when manufacturing their tools

Behaviour ◽  
2017 ◽  
Vol 154 (1) ◽  
pp. 65-91 ◽  
Author(s):  
Brenna Knaebe ◽  
Alex H. Taylor ◽  
Douglas M. Elliffe ◽  
Russell D. Gray
Keyword(s):  
Behavioural Flexibility ◽  
Tool Manufacture ◽  
In The Wild ◽  
New Caledonian Crows ◽  
Do So

New Caledonian crows have demonstrated flexible behaviour when using tools and solving novel problems. However, we do not know whether this flexibility extends to tool manufacture. Here, we show that these crows respond to different tool-using problems by altering the length of the tools that they manufacture; on average, crows made shorter tools for tasks requiring short tools and longer tools for tasks requiring long tools. They continued to do so when they could not simultaneously see the tool-manufacturing material and the apparatus requiring the use of a tool. Despite altering the length of their tools, the crows frequently did not make tools short or long enough to reliably extract the bait, though this may have been due to shortcomings in the task presented to them. Our results demonstrate that these crows have a degree of behavioural flexibility when making tools, which may be used in the wild during foraging.

Dumbledore’s army: civil disobedience in “Harry Potter and The Order of the Phoenix”

2020 ◽  
Vol 6 (1) ◽  
pp. 177-198
Author(s):  
Arthur Emanuel Leal Abreu ◽  
Alexandre de Castro Coura
Keyword(s):  
Real Life ◽  
Civil Disobedience ◽  
School Community ◽  
Harry Potter ◽  
Law And Literature ◽  
The Novel ◽  
Persuasive Strategies ◽  
Law In Literature ◽  
The Phoenix ◽  
Do So

This paper explores the connection between law and literature, considering the concept of civil disobedience as developed in the plot of the novel “Harry Potter and the Order of the Phoenix”. To do so, this research uses the approach of law in literature, by linking the actions of Dumbledore’s Army to the theory of civil disobedience by Dworkin. Also, the narrative is compared to the conception of civil disobedience as a fundamental right, based on the conflict between facticity and validity, as described by Habermas. Thus, the analysis identifies, in the novel, two categories of civil disobedience proposed by Dworkin, and discusses, in real life, the overlapping of disobedience based on justice and on politics, in order to identify the conditions that justify actions of civil disobedience. Besides that, this paper analyzes the tension between legality and legitimacy, considering the decisions of the Ministry of Magic and its educational decrees, which sets the school community apart from the official political power. In conclusion, the research examines the use of persuasive and non-persuasive strategies and the reach of civil disobedience’s purposes based on the actions of Harry Potter and of Dumbledore’s Army.

The Effects of Second Life on the Motivation of EFL Student Teachers

2019 ◽  
pp. 86-114 ◽  
Author(s):  
Galip Kartal ◽  
Cem Balçıkanlı
Keyword(s):  
Student Teachers ◽  
Second Life ◽  
Virtual World ◽  
Teaching And Learning ◽  
Real Life ◽  
Structured Interviews ◽  
Group Interviews ◽  
Free Environment

This study aimed at investigating the effects of using a virtual world, Second Life (SL), on the motivation of Turkish EFL student teachers. First, a 10-week real-life task syllabus was designed and conducted in SL. Focus-group interviews were utilized to enhance the quality of the tasks. Then, the effects of SL on motivation were tracked via qualitative research tools, namely semi-structured interviews, weekly evaluation forms, and observations. The findings showed that SL was effective in increasing motivation of the participating student teachers. The characteristics of the virtual world that were reported to have an effect on motivation were as follows: natural environment, realistic places, anxiety-free environment, excitement, and visual support. This chapter provides possibilities for those who are interested in employing virtual world technologies in foreign/second language teaching and learning and finally describes an investigation into the role of the virtual world in relation to affordances such technologies present across the globe.

scholarly journals Male-only care and cuckoldry in black coucals: does parenting hamper sex life?

2019 ◽  
Vol 286 (1900) ◽  
pp. 20182789 ◽  
Author(s):  
Ignas Safari ◽  
Wolfgang Goymann ◽  
Hanna Kokko
Keyword(s):  
Parental Care ◽  
Paternal Care ◽  
Real Life ◽  
Life Care ◽  
Trade Offs ◽  
Mating Opportunities ◽  
Siring Success ◽  
Theoretical Considerations ◽  
Operational Sex Ratios ◽  
Do So

Providing parental care often reduces additional mating opportunities. Paternal care becomes easier to understand if trade-offs between mating and caring remain mild. The black coucalCentropus grilliicombines male-only parental care with 50% of all broods containing young sired by another male. To understand how much caring for offspring reduces a male's chance to sire additional young in other males' nests, we matched the production of extra-pair young in each nest with the periods during which potential extra-pair sires were either caring for offspring themselves or when they had no own offspring to care for. We found that males which cared for a clutch were not fully excluded from the pool of competitors for siring young in other males' nests. Instead, the relative siring success showed a temporary dip. Males were approximately 17% less likely to sire young in other males' nests while they were incubating, about 48% less likely to do so while feeding nestlings, followed by 26% when feeding fledglings, compared to the success of males that currently did not care for offspring. These results suggest that real-life care situations by males may involve trade-off structures that differ from, and are less strict than those frequently employed in theoretical considerations of operational sex ratios, sex roles and parenting decisions.

Rebound Effects of Thought Suppression: Instruction-Dependent?

1991 ◽  
Vol 19 (3) ◽  
pp. 225-238 ◽  
Author(s):  
Harald Merckelbach ◽  
Peter Muris ◽  
Marcel van den Hout ◽  
Peter de Jong
Keyword(s):  
Thought Suppression ◽  
Ecological Validity ◽  
Rebound Effect ◽  
Real Life ◽  
Normal Subjects ◽  
Laboratory Model ◽  
Rebound Effects ◽  
Cast Doubt ◽  
Do So

Previous studies have shown that when normal subjects are instructed to think of a white bear (“forced” expression instructions), they do so more frequently when they have previously suppressed the thought of a white bear than when they have not suppressed this thought. It has been proposed that this rebound effect of thought suppression provides a laboratory model for the development of real-life obsessions. The present studies were undertaken in order to explore further the tenability of this model. Rebound effects were evaluated when more “liberal” expression instructions (“you might think of a white bear, but you don't have to”) were used. In Experiment 1, no evidence was obtained to suggest that suppression results in a heightened frequency and/or accelerated rate of white bear thoughts during a subsequent expression period (with “liberal” instructions). Interestingly, initial suppression lead to an immediate and stable increase of thought related electrodermal fluctuations. In Experiment 2, it was found that successful suppressors (few target thoughts during suppression) report fewer white bear thoughts during expression (with “liberal” instructions) than unsuccessful suppressors (many target thoughts during suppression). Assuming that the ecological validity of “liberal” expression instructions is greater than that of “forced” instructions, the present findings cast doubt on the claim that the rebound effect mimics the etiology of obsessions. The findings also suggest that it may be the immediate counter-productive effects of suppression that are relevant to theories concerned with obsessions.

scholarly journals Pavlovian fear conditioning does not readily occur in rats in naturalistic environments

2021 ◽  
Author(s):  
Peter R Zambetti ◽  
Bryan P Schuessler ◽  
Bryce Lecamp ◽  
Andrew Shin ◽  
Eun Joo Kim ◽  
...  
Keyword(s):  
Fear Conditioning ◽  
Survival Function ◽  
Real Life ◽  
Pavlovian Fear Conditioning ◽  
Subsequent Test ◽  
Future Behavior ◽  
The Standard Model ◽  
Life Threatening ◽  
First Time ◽  
Do So

Pavlovian fear conditioning, which offers the advantage of simplicity in both the control of conditioned and unconditioned stimuli (CS, US) presentation and the analysis of specific conditioned and unconditioned responses (CR, UR) in a controlled laboratory setting, has been the standard model in basic and translational fear research. Despite 100 years of experiments, the utility of fear conditioning has not been trans-situationally validated in real-life contexts. We thus investigated whether fear conditioning readily occurs and guides the animal's future behavior in an ecologically-relevant environment. To do so, Long-Evans rats foraging for food in an open arena were presented with a tone CS paired with electric shock US to their dorsal neck/body that instinctively elicited escape UR to the safe nest. On subsequent test days, the tone-shock paired animals failed to exhibit fear CR to the CS. In contrast, animals that encountered a realistic agent of danger (a looming artificial owl) paired with a shock, simulating a realistic predatory strike, instantly fled to the nest when presented with a tone for the first time. These results illustrate the survival function and precedence of a nonassociative process, rather than associative conditioning, in life-threatening situations that animals are likely to encounter in nature.

scholarly journals APCs in the Wild: could monitoring and tracking of OA payments help speed up the transition to OA?

2020 ◽  
Author(s):  
Mithu Lucraft
Keyword(s):  
Open Access ◽  
Complete Picture ◽  
Adequate Funding ◽  
In The Wild ◽  
Speed Up ◽  
The Cost ◽  
Do So

Accelerating progress towards full and immediate open access (OA) is reliant on being able to source adequate funding to cover the costs of gold OA. Monitoring and tracking OA payments has created a complex and challenging role for institutions, but is crucial in order to understand the complete picture of the cost of OA. Whilst some institutions have developed methods to monitor OA payments, there remain a high number of "APCs in the wild", or APC payments whose origins are difficult to track. In this presentation we will summarise research Springer Nature has undertaken to explore the tracking and monitoring of APC payments, including interviews and a survey of global librarians, and data from Springer Nature authors to better understand the sources of APC funding, and the motivations and challenges concerning the monitoring of APCs. We will focus on feedback from institutions on the routes to implement better tracking, and on the noted benefits of being able to do so in enabling a faster transition to OA.  

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