scholarly journals Experiments in Time Perception

1964 ◽  
Vol 9 (5) ◽  
pp. 396-410 ◽  
Author(s):  
Daniel Cappon ◽  
Robert Banks
Keyword(s):  
Time Perception ◽  
Subjective Time ◽  
Temporal Experience ◽  
Testing Conditions ◽  
Laboratory Conditions ◽  
Reliable Effect ◽  
Past Life ◽  
Normal Laboratory

Experimentation was carried out to test for a relationship between subjective time perception and ability to make temporal judgements. The performance of 20 depersonalized and derealized patients and 20 controls, was compared on a variety of tests of time judgement administered under normal laboratory conditions and under conditions which have been shown to induce or amplify distortions in subjective temporal experience. The results failed to indicate any reliable relationship between subjective temporal experience and ability to make time judgements. The performance of patients did not differ reliably from that of controls under any of the testing conditions; exposure to distorting conditions did not have a reliable effect on temporal performance and Ss who reported temporal distortions either in their past life or while actually performing the tests of time judgement, failed to perform differently from Ss who did not report distortions.

Discounting Time and Time Discounting: Subjective Time Perception and Intertemporal Preferences

2009 ◽  
Vol 46 (4) ◽  
pp. 543-556 ◽  
Author(s):  
Gal Zauberman ◽  
B. Kyu Kim ◽  
Selin A. Malkoc ◽  
James R. Bettman
Keyword(s):  
Time Perception ◽  
Hyperbolic Discounting ◽  
Subjective Time ◽  
Multiple Time ◽  
Subjective Perceptions ◽  
Objective Time ◽  
Trade Offs ◽  
Intertemporal Preferences ◽  
Constant Rate ◽  
Within Subjects

Consumers often make decisions about outcomes and events that occur over time. This research examines consumers' sensitivity to the prospective duration relevant to their decisions and the implications of such sensitivity for intertemporal trade-offs, especially the degree of present bias (i.e., hyperbolic discounting). The authors show that participants' subjective perceptions of prospective duration are not sufficiently sensitive to changes in objective duration and are nonlinear and concave in objective time, consistent with psychophysical principles. More important, this lack of sensitivity can explain hyperbolic discounting. The results replicate standard hyperbolic discounting effects with respect to objective time but show a relatively constant rate of discounting with respect to subjective time perceptions. The results are replicated between subjects (Experiment 1) and within subjects (Experiments 2), with multiple time horizons and multiple descriptors, and with different measurement orders. Furthermore, the authors show that when duration is primed, subjective time perception is altered (Experiment 4) and hyperbolic discounting is reduced (Experiment 3).

Method for Measuring the Rate of Subjective Time

1967 ◽  
Vol 24 (3_suppl) ◽  
pp. 1235-1240 ◽  
Author(s):  
James J. McGrath ◽  
James F. O'Hanlon
Keyword(s):  
Individual Differences ◽  
Real Time ◽  
Linear Function ◽  
Time Perception ◽  
Test Session ◽  
Subjective Time ◽  
Systematic Effect ◽  
Standard Interval

A method was developed for measuring rate of subjective time ( RST). Subjective time ( T) was recorded in subjects making a series of contiguous estimations of a standard interval of time. The results showed that T generally increased as a linear function of real time ( t). RST was measured by describing T as a linear function of t and by differentiating that function in respect to t. Individual differences in RST were large and stable within a test session. The differences were reliable from one session to the next. Within the range studied (1 to 10 min.) the duration of the standard interval had no systematic effect upon RSTs. And, RSTs were related in the appropriate direction to traditional measures of time perception. It was concluded that the RST is a useful measure for research on time perception.

Intrinsic strength and the structure of glass

2020 ◽  
Vol 61 (6) ◽  
pp. 239-247
Author(s):  
C. R. Kurkjian ◽  
◽  
P. K. Gupta ◽  
Keyword(s):  
Composition Dependence ◽  
Structural Information ◽  
High Strength ◽  
Laboratory Conditions ◽  
Normal Laboratory ◽  
Intrinsic Strength ◽  
Glass Compositions

Intrinsic strength is the strength of a glass without extrinsic flaws. Knowledge of the composition dependence of the intrinsic strength is important both technologically for the development of high strength glass compositions and theoretically as it may provide important structural information. Intrinsic strength is easy to define but difficult to measure experimentally. In this paper we discuss intrinsic (σ*) strength measured in normal laboratory conditions as well as the inert intrinsic (σ0*) strength. We define these terms in a rigorous manner and indicate how to gauge if they have been measured by developing a set of criteria. Based on these criteria, we tabulate those values of intrinsic strengths that have been measured to date.

Age Effects in Perception of Time

2005 ◽  
Vol 97 (3) ◽  
pp. 921-935 ◽  
Author(s):  
Marc Wittmann ◽  
Sandra Lehnhoff
Keyword(s):  
Time Perception ◽  
Nonlinear Regression ◽  
Age Effects ◽  
Chronological Age ◽  
Subjective Time ◽  
Regression Analyses ◽  
Empirical Results ◽  
Widespread Belief ◽  
Perception Of Time ◽  
Pearson Correlations

Despite the widespread belief that the subjective speed of the passage of time increases with age, empirical results are controversial. In this study, a combination of questionnaires was employed to assess subjective time perception by 499 subjects, ages 14 to 94 years. Pearson correlations and nonlinear regression analyses on a variety of questionnaires and the age of the participants show that the momentary perception of the passage of time and the retrospective judgment of past periods of time are a function of chronological age; however, small-to-moderate effects accounted for at most 10% of the variance. Results generally support the widespread perception that the passage of time speeds up with age. These results are discussed in the context of models of prospective and retrospective time judgment, but interpretations have to be treated with caution given methodological limitations.

Centrifugal Manometer

1959 ◽  
Vol 81 (3) ◽  
pp. 341-348
Author(s):  
J. F. Kemp
Keyword(s):  
High Sensitivity ◽  
Working Fluid ◽  
Quick Response ◽  
Laboratory Conditions ◽  
Wide Range ◽  
Maximum Range ◽  
Normal Laboratory

The operating principles and mechanical construction of a micromanometer, which utilizes air in lieu of a liquid as working fluid, are described. Some of the noteworthy features of the instrument include its high sensitivity and accuracy, quick response, wide range, and ease of manipulation. Differential pressures of the order of 5 × 10−3 mm water gage can be measured with an error of 1 per cent under normal laboratory conditions. The maximum range of the prototype described is 25 mm water gage, and the corresponding error at this value amounts to about 0.25 per cent.

scholarly journals THE ROLE OF COMPLEMENT IN RESISTANCE TO ENDOGENOUS AND EXOGENOUS INFECTION WITH A COMMON MOUSE PATHOGEN, CORYNEBACTERIUM KUTSCHERI

1966 ◽  
Vol 124 (4) ◽  
pp. 689-699 ◽  
Author(s):  
Linda D. Caren ◽  
L. T. Rosenberg
Keyword(s):  
Survival Advantage ◽  
Mouse Serum ◽  
Equal Frequency ◽  
Laboratory Conditions ◽  
Immune Hemolysis ◽  
The Common ◽  
Deficient Mice ◽  
Normal Laboratory ◽  
Better Than

In mice, the presence or absence of a single complement (C') component, called hc1, is controlled by two alleles at the Hc locus. The sera of mice which lack this C' component do not manifest C'-mediated immune hemolysis. When challenged with the common mouse pathogen, Corynebacterium kutscheri, mice possessing hemolytic C' fare slightly better than C'-deficient mice. When mice harboring latent C. kutscheri are administered hydrocortisone, which depresses mouse serum C' levels, pseudotuberculosis is activated with equal frequency in mice of both C' types. These data suggest that in at least one situation the presence of the complete hemolytic C' system may be advantageous to the mouse. In contrast, evidence is presented which shows that under normal laboratory conditions, C'-deficient B10.D2 "old line" mice (Hc0/Hc0) have a survival advantage over C'-positive B10.D2 "new line" mice (Hc1/Hic1) during the first 3 wk of life. It is therefore concluded that mouse hemolytic C' has a balanced survival value—that is, under one set of conditions it may be advantageous, whereas in another situation, it may be disadvantageous.

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