EEG characteristics prior to and following the evoked K-Complex.

This study was designed to determine if the K-Complex reflects an arousal from sleep or a sleep protection mechanism. Ten participants were presented auditory stimuli every 20 s while asleep. Trials were sorted according to the presence or absence of a K-Complex. A fast Fourier Transformation of the data was computed on EEG segments prior to and following stimulus onset. The log power of activity in delta, theta, alpha, sigma, and beta bandwidths was computed. When a K-Complex was elicited, there were no differences in EEG activity prior to and following the stimulus. However, during slow wave sleep, when a K-Complex was not elicited, there was a significant overall increase in theta, alpha, sigma, and beta activity following stimulus. These results tend to support the notion that the K-Complex appears to prevent arousal.     

Screening Job Applicants: The Impact of Physical Attractiveness and Application Quality

The present study investigated the impact of physical attractiveness and résuméquality on the evaluation of job applicants in the screening phase of the selection process. One hundred and eighty participants were asked to imagine they were a recruiting officer and to screen an application for the position of graduate trainee manager. Participants read a job advertisement and one of two versions of a curriculum vitae, which differed in quality. Attached to the front page of each curriculum vitae was a passport-sized head-and-shoulders photograph of either an average or an attractive female. A control condition with no attached photograph was also included. Participants judged the likelihood with which they would offer an interview to the applicant, the quality of the application, and the likely starting salary they would offer the applicant. Results indicated that attractiveness had no impact when the quality of the application was high but that attractiveness was an advantage when the application was mediocre. When the résumé quality was average the attractive applicant was evaluated more positively than the control, no photograph, applicant; an attractive photograph boosted the evaluation of a mediocre application. Results are discussed in terms of discrimination and implications for the field of human resource management.     

The role of eye movements in subitizing and counting

Previous work has suggested that eye movements may be necessary for accurate enumeration beyond the subitization range of about 4 items. This study determined the frequency of eye movements normally made during enumeration, their relationship to response times, and whether they are required for accurate performance. This was achieved by monitoring eye movements and comparing performance when observers were allowed to saccade and when they were not. The results showed that (a) there was a sharp increase in saccadic frequency beyond about 4 items (from < 0.2 saccades per item to about 1 per item), and (b) enumeration of fewer than 4 items remained rapid and accurate even when eye movements were prevented, whereas enumeration beyond this became less efficient and sometimes less accurate. The results are discussed in relation to the memory and processing requirements of enumeration tasks.     

Response-specific effects of pain observation on motor behavior

How does seeing a painful event happening to someone else influence the observer's own motor system? To address this question, we measured simple reaction times following videos showing noxious or innocuous implements contacting corporeal or noncorporeal objects. Key releases in a go/nogo task were speeded, and key presses slowed, after subjects saw a video of a needle pricking a fingertip. No such effect was seen when the observed hand was replaced by a sponge, nor when the needle was replaced by a cotton bud. These findings demonstrate that pain observation modulates the motor system by speeding withdrawal movements and slowing approach movements of the finger. This illustrates a basic mechanism by which visual information about pain is used to facilitate appropriate behavioral responses.