Electrooculographic indices of changes in simulated flying performance

Recent investigations have revealed statistically reliable relationships between signal detection by human subjects performing vigilance tasks and changes in the electrophysiologically recorded waveform of the eyeblink. Thus, this relatively simple and easy-to-obtain measure may have potential use as a predictor of impaired performance. This report describes a study in which eyeblink data were recorded on analog tape while subjects (instrument-rated pilots) “flew” a computer-generated flight plan in a General Aviation Trainer (GAT-1). Eyeblink data were reduced and scored with an adaptation of software from the Washington University Behavioral Research Laboratory. Subjects’ “flying” performance was evaluated with the Pilot Performance Evaluating System (PPES) implemented on a Digital Equipment Corporation (DEC), PDP-11/34 computer. The PPES samples each of four primary flight instruments once per second. It scores performance by generating a combined error score for each maneuver it assigns on the flight-plan display in the cockpit. The PPES/GAT-1 linkup has proved to be a valuable research tool with which to realistically evaluate stress effects and physiological correlates of flying performance in a laboratory setting. This study examined the relationships between eyeblink and flying performance scores collected during a pilot-fatigue study. Analysis of the data supports the use of computers cored eye movement measures as predictors of flying performance decrements.     

The gender-stereotyped nature of christmas toys received by 36-, 48-, and 60-month-old children: A comparison between nonrequested vs requested toys

This research provides normative information on the gender-stereotyped nature of Christmas toys that children received from their parents. A list of over 500 toys was obtained from the parents of 86 children between the ages of 31 and 65 months. The toys were rated and placed into gender-stereotyped groups, and were categorized into child requested or nonrequested groups. It was found that the children had considerable input into the types of toys they received from their parents for Christmas, requesting approximately one half of the toys. Toys the children requested were judged to be more gender stereotyped than nonrequested toys. Very few boys received either requested or nonrequested toys considered stereotyped for the opposite sex. In contrast, one third of the girls received at least one toy judged to be stereotyped for the opposite sex. Also, boys appeared to develop sex-typed interests in toys at an earlier age than girls, and they requested 72%, 76%, and 75% gender-stereotyped toys in the corresponding age groups of 36-, 48-, and 60-months. The girls' sex-typed interests in toys lagged behind the boys', with girls requesting 29%, 51%, and 73% gender-stereotyped toys for the same age groups. In the nonrequested condition, parents selected types of toys judged to be traditionally more sex role neutral and emphasized musical instruments, art supplies, and educational toys for their sons and educational toys for their daughters.     

Aphasia for Morse code

The ability to communicate by Morse code at high speed has, to our knowledge, not been localized within the cerebral cortex, but might be suspected as residing within the left (dominant) hemisphere. We report a case of a 54-year-old male who suffered a left temporal tip intracerebral hematoma and who temporarily lost his ability to communicate in Morse code, but who was minimally aphasic.     

Habituation to irrelevant speech: effects on a visual short-term memory task

The Baddeley and Hitch (1974) formulation of short-term or working memory embodied a phonological store within the articulatory loop component of the model. Later formulations specifically postulated an acoustic filter that endowed only speech-like stimuli with obligatory access to this phonological store. This paper presents evidence that this phonological store may have two filters, one of which is subject to habituation and can therefore attenuate the entry of irrelevant speech, thus undermining the obligatory access assumption of the model. An experiment is reported in which subjects were presented with a habituation period comprising 20 min of irrelevant speech--speech to be ignored by the subject--before a test phase in which a visually presented serial recall task with concurrent irrelevant speech was performed. The effect of irrelevant speech, which impairs performance on the primary task when there is no habituation phase, is reduced markedly in those conditions where the speech used in the habituation phase is the same as that used in the test phase, if the irrelevant speech is in a language different from that presented during the subsequent trials or if the habituator is a hummed version of the irrelevant speech passage. When a nonspeech sound (pink noise) is used in the habituation phase, a large irrelevant speech effect is found in the test phase. Morris, Quayle, and Jones (1989) found that humming did not produce an irrelevant speech effect, which suggests that the first filter is permeable to humming but that the second filter is not.(ABSTRACT TRUNCATED AT 250 WORDS)     

Knowledge and the regularity theory of information

Fred Dretske's Knowledge and the Flow of Information is an extended attempt to develop a philosophically useful theory of information. Dretske adapts central ideas from Shannon and Weaver's mathematical theory of communication, and applies them to some traditional problems in epistemology. In doing so, he succeeds in building for philosophers a much-needed bridge to important work in cognitive science. The payoff for epistemologists is that Dretske promises a way out of a long-standing impasse — the Gettier problem. He offers an alternative model of knowledge as information-based belief, which purports to avoid the problems justificatory accounts face. This essay looks closely at Dretske's theory. I argue that while the information-theoretic framework is attractive, it does not provide an adequate account of knowledge. And there seems to be no way of tightening the theory without introducing some version of a theory of justification — the very notion Dretske's theory was designed to avoid.     

Eye movement guidance in reading: the role of parafoveal letter and space information

The relation between parafoveal letter and space information in eye movement guidance during reading was investigated in 2 experiments. Contingent upon the reader's fixation, the type of parafoveal information available to the right of fixation was varied by (a) space information only, (b) space information with letter information added at some delay, or (c) letter and space information simultaneously. In addition, the onset of the relevant parafoveal information was delayed between 0 and 250 ms into the fixation. The time course of processing the 2 types of information (letters or spaces) differed, as did the nature of their impact on the eye movement record. Although both letter and space information influenced saccade length and initial landing positions within words, only letter information had an effect on fixation duration. In addition, fixation duration was affected only by information entering within the first 50 ms of the fixation, whereas saccade length was affected by information arriving at any time during the fixation. The results are consistent with a model of eye movement control in which 2 independent processes are operating in tandem to determine when and where to move the eyes during reading.     

The revised conners parent rating scale: Factor structure replication with a diversified clinical sample

The Revised Conners Teacher Rating Scale was completed as part of a comprehensive evaluation of 135 consecutive new patients seen in the Pediatric Neurology Learning Disability Clinic at the Medical College of Georgia. The questionnaires were subjected to principal components analysis with varimax rotation. Item analysis was conducted on the obtained subscales, and convergent validity was determined by correlation with the Revised Behavior Problem Checklist (Quay & Peterson, 1987). Finally, comparisons of the diagnostic groups were carried out across the subscales.I would like to thank Harry Davis, Office of Research Computing and Statistics, Medical College of Georgia, for his invaluable help in carrying out the computer analysis of the data.     

Toward the self-regulation of mood: Theory and research

Moods, defined as diffuse or global feeling states, may lead us to take self-regulatory action designed to maintain them (good moods) or eliminate them (bad moods). This paper first surveys theories that help explain the origin and nature of such feeling states and then goes on to review and evaluate evidence purporting to demonstrate that self-regulation of mood occurs. Some support was found for the idea that people in bad moods will engage in various self-gratifying or self-indulgent acts as therapy. Other techniques that appear to be used are alcohol consumption and self-serving cognitive processes. The evidence regarding other sorts of self-regulation is fragmentary and/or anecdotal. It is argued that research on the self-regulation of mood would profit from better theoretical development, and some ideas along these lines are offered.The authors are grateful to Margaret S. Clark, Jay Hull, Alice Isen, Robert Kleck, Kevin McConkey, and Paula Schnurr for comments on a previous draft of this paper.