Biomedical subjects

N Titov

Publications and source records attributed to N Titov.

3 recordsLinked to original sources

PubMed2000

A procedure for testing prospective remembering in persons with neurological impairments.

A video-based procedure for assessing prospective remembering (PR) in brain-injured clients is described. In this task, a list of instructions is given, each comprising an action (buy a hamburger) and a cue (at McDonalds), which are to be recalled while watching a videotape segment showing the view of a person walking through a shopping area. A group of 12 clients with varying degrees of memory impairment undergoing rehabilitation completed both a video test and a comparable task in real-life. Significant correlations were found between the two measures, indicating that a video-based analogue can be used to estimate prospective remembering in real life. Scores on the PR task were associated with accuracy of recall on a word-list task, but not with the Working Memory Index of the Wechsler Memory Scale-III, suggesting that the task is sensitive to levels of amnesic deficit.

Adult↗

PubMed1999

Does habitual, vigorous optokinetic stimulation alter optokinetic nystagmus and sensitivity to circularvection?

Previous studies have shown that experience with optokinetic stimulation can alter a subject's sensitivity to illusions such as circularvection (CV). The aim of the present experiment was to compare optokinetic nystagmus (OKN), optokinetic afternystagmus (OKAN), and sensitivity to CV between 2 groups of sportspeople: 1) squash players (n = 16), who regularly experience vigorous optokinetic stimulation while engaging in their sporting activity, and 2) weightlifters (n = 16), whose sport does not involve the same degree of optokinetic stimulation as squash, but who nevertheless have to achieve a high degree of physical skill. OKN, OKAN (frequency, slow phase velocity, and timeconstant), and latency to CV (Stage 2 and Stage 3) were measured using electro-oculographic recording inside an optokinetic drum. Contrary to predictions, there were no significant differences in OKN, OKAN, or latency to CV between the 2 groups. These results suggest that 1) the practice effects that alter the sensitivity to CV may decay relatively quickly, and 2) differences in recreational sporting activities between subjects may not be a significant confounding factor in visual-vestibular interaction experiments.

Adolescent↗

PubMed1997

Adult age differences in controlled and automatic memory processing.

The memory performance of groups of younger, middle-aged, and older participants was tested on indirect and direct tests of word stem completion and on a process-dissociation task. As expected, on the direct tests of stem completion, older participants had lower scores than the younger and middle-aged groups. Age effects were also found on the indirect word completion test. The process-dissociation task allowed memory performance to be divided into controlled and automatic processing components. Estimates of automatic processing were comparable for the three groups, but there was an age effect for controlled processing, with the middle-aged and older groups differing from the younger group. These results confirm the findings of J. M. Jennings and L. L. Jacoby (1993) and suggest that the decline in conscious processing efficiency begins in middle age.

Adult↗