‘Please sort these voice recordings into 2 identities’: Effects of task instructions on performance in voice sorting studies

We investigated the effects of two types of task instructions on performance on a voice sorting task by listeners who were either familiar or unfamiliar with the voices. Listeners were asked to sort 15 naturally varying stimuli from two voice identities into perceived identities. Half of the listeners sorted the recordings freely into as many identities as they perceived; the other half were forced to sort stimuli into two identities only. As reported in previous studies, unfamiliar listeners formed more clusters than familiar listeners. Listeners therefore perceived different naturally varying stimuli from the same identity as coming from different identities, while being highly accurate at telling apart the stimuli from different voices. We further show that a change in task instructions – forcing listeners to sort stimuli into two identities only – helped unfamiliar listeners to overcome this selective failure at ‘telling people together’. This improvement, however, came at the cost of an increase in errors in telling people apart. For familiar listeners, similar non-significant trends were apparent. Therefore, even when informed about correct number of identities, listeners may fail to accurately perceive identity further highlighting that voice identity perception in the context of natural within-person variability is a challenging task. We discuss our results in terms of similarities and differences to findings in the face perception literature and their importance in applied settings, such as forensic voice identification.     

Religiosity,Secular Participation,and Cultural Socialization: A Case Study of the 1933–1942 Urban English Cohort

The nature of secularization is of enduring interest in the social science of religion. Numerous recent papers have established downward cohort trends as characterizing religious change. We examine potential mechanisms by assessing cultural participation and secular engagement during the formative period of one cohort. We provide estimates of active and nominal religiosity, nonreligion and religious belief for those born between 1933 and 1942, using multiple surveys fielded between 1957 and 2018. We model the association between religiosity and secular cultural and social participation for this cohort in 1957, then examine how cultural socialization in childhood relates to religiosity in their later adulthood using surveys fielded between 2005 and 2007. Increased secular competition is found to be associated with less active religiosity. These trends were underpinned by an ethic of increasing autonomy for the young. We conclude by affirming the link between increasing secular competition, long-run modernization, and changing cultural socialization.     

The interaction of binocular disparity and motion parallax in determining perceived depth and perceived size.

Although binocular disparity and motion parallax are powerful cues for depth, neither, in isolation, can specify information about both object size and depth. It has been shown that information from both cues can be combined to specify the size, depth, and distance of an object in a scene (Richards, 1985 Journal of the Optical Society of America A 2 343-349). Experiments are reported in which natural viewing and physical stimuli have been used to investigate the nature of size and depth perception on the basis of disparity and parallax presented separately and together at a range of viewing distances. Observers adjusted the relative position of three bright LEDs, which were constrained to form a triangle in plan view with the apex pointing toward the observer, so its dimensions matched that of a standard held by the subject. With static monocular viewing, depth settings were inaccurate and erratic. When both cues were present together accuracy increased and the perceptual outcome was consistent with an averaging of the information provided by both cues. When an apparent bias evident in the observers' responses (the tendency to under-estimate the size of the standard) was taken into account, accuracy was high and size and depth constancy were close to 100%. In addition, given this assumption, the same estimate of viewing distance was used to scale size and depth estimates.     

Careers work in higher education in Pakistan: current practice and options for the future

ABSTRACT

In this article we examine the development of career guidance in Pakistani higher education. The article is based on a literature review supplemented with new data gathered from a review of higher education institutions' websites and five case study interviews. It considers both local and global influences as relevant contexts for understanding how the development of career guidance in Pakistani higher education is taking place. Concerns about alignment between skills supply and demand provide key drivers both for the development of career guidance and for a wider higher education reform. The practice of career guidance in Pakistani higher education is shown to be lagging behind policy and will need to be strengthened by new policy, resources and indigenous theories.     

Choice between Delayed Reinforcers: Interaction between Delay and Deprivation Level

Choice between two reinforcers differing in magnitude and delay was investigated in rats maintained at 80% ( n = 10) or 90% ( n = 10) of their free-feeding body weights using discrete-trials adjusting-delay schedules in which the two reinforcers (S\[mall] and L\[arge]) were associated with different levers. In each phase of the experiment the delay to the smaller reinforcer ( dS ) was held constant, and the delay to the larger reinforcer ( dL ) was varied in accordance with the distribution of choices in successive blocks of trials. The value of dS was varied across the four phases of the experiment (2, 4, 8, and 2 sec). When dS was 2 sec, the mean value of dL was higher in the rats maintained at 80% than in those maintained at 90% of their free-feeding body weights. When dS was increased, the value of dL increased in both groups; however the effect of deprivation level was abolished. The results are consistent with a model of choice that posits hyperbolic relations between reinforcer value and reinforcer magnitude, and between reinforcer value and delay of reinforcement.