An ultra-low-power programmable analog bionic ear processor

We report a programmable analog bionic ear (cochlear implant) processor in a 1.5-microm BiCMOS technology with a power consumption of 211 microW and 77-dB dynamic range of operation. The 9.58 mm x 9.23 mm processor chip runs on a 2.8 V supply and has a power consumption that is lower than state-of-the-art analog-to-digital (A/D)-then-DSP designs by a factor of 25. It is suitable for use in fully implanted cochlear-implant systems of the future which require decades of operation on a 100-mAh rechargeable battery with a finite number of charge-discharge cycles. It may also be used as an ultra-low-power spectrum-analysis front end in portable speech-recognition systems. The power consumption of the processor includes the 100 microW power consumption of a JFET-buffered electret microphone and an associated on-chip microphone front end. An automatic gain control circuit compresses the 77-dB input dynamic range into a narrower internal dynamic range (IDR) of 57 dB at which each of the 16 spectral channels of the processor operate. The output bits of the processor are scanned and reported off chip in a format suitable for continuous-interleaved-sampling stimulation of electrodes. Power-supply-immune biasing circuits ensure robust operation of the processor in the high-RF-noise environment typical of cochlear implant systems.     

Fixation disparity: binocular vergence accuracy for a visual display at different positions relative to the eyes

Some observers do not fixate accurately at the point of regard: Their vergence angle (between the visual axes of the two eyes) may correspond to points slightly nearer or farther away. This vergence error, or fixation disparity, was measured with nonius (vernier) lines at six positions of a visual display relative to the eyes. At viewing distances of 40, 60, and 100 cm, the display was located either at eye level or at a downward inclination of gaze direction of -25 degrees relative to horizontal. Viewing conditions resembled typical office work. Lowering the screen induced a near shift in mean vergence response of 0.6 min arc, irrespective of viewing distance; the closer the screen, the more distant was the vergence response relative to the target (by 2.5 min arc on average). The slope of this proximity-fixation-disparity curve is an individual parameter of the vergence system. Actual or potential applications of this research include recommendations for the comfortable viewing distance of visual displays.     

ADAPT: A Predictive Cognitive Model of User Visual Attention and Action Planning

We present a computational cognitive model of novice and expert aviation pilot action planning called ADAPT that models performance in a dynamically changing simulated flight environment. We perform rigorous tests of ADAPT's predictive validity by comparing the performance of individual human pilots to that of their respective models. Individual pilots were asked to execute a series of flight maneuvers using a flight simulator, and their eye fixations and control movements were recorded in a time-synched database. Computational models of each of the 25 individual pilots were constructed, and the individual models simulated execution of the same flight maneuvers performed by the human pilots. The time-synched eye fixations and control movements of individual pilots and their respective models were compared, and rigorous tests of ADAPT's predictive validity were performed. The model explains and predicts a significant portion of pilot visual attention and control movements during flight as a function of piloting expertise. Implications for adaptive training systems are discussed.     

Role of manual-guided training in the conduct and efficacy of interpersonal psychotherapy for depression.

This article reviews findings from manual-guided training programs in short-term interpersonal psychotherapy (IPT) for depression, an exploratory treatment that focuses on symptom reduction and improvement of social functioning. The literature revealed (a) that experienced, dynamically trained therapists were able to achieve a high level of competence in IPT after comparatively brief training and were able to maintain adherence to the manual over a lengthy study; (b) that general dimensions of the psychotherapy process, including therapist warmth and patient difficulty, were highly correlated with ratings of therapist competence in the performance of IPT; and (c) that therapists judged as performing IPT more competently tended to be more effective. Although definitive evidence on the effectiveness of manual-guided training is lacking, the use of manuals and systematic therapist training appear to be useful for the conduct of psychotherapy efficacy research. Findings showing that manual adherence is related to therapist efficacy suggest a role for these procedures in clinical training and competency determination. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Social influences on children's problem solving.

Three studies examined the nature and limiting conditions of effects of peer interaction on children's problem solving. 150 children (4 to 11 years old) worked alone or with a same-age peer at a computer. Age, task complexity, and task familiarity were found to qualify effects of peer interaction on both motivation and learning. At all ages, except when the task was very complex or very familiar, working with a peer increased task engagement and positive affect. For younger preschool children, working with a peer had no effect on retention of simple or moderately complex tasks but had a negative effect on retention of more complex tasks. For older preschool children, peer interaction had a positive effect on retention of simple tasks, a neutral effect on retention of moderately complex tasks, and a negative effect on retention of more complex tasks. For elementary-school children, peer interaction had a positive effect on retention of even the most complex tasks. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Prosocial development in early adulthood: A longitudinal study.

Consistency of measures of a prosocial personality and prosocial moral judgment over time, and the interrelations among them, were examined. Participants' and friends' reports of prosocial characteristics were obtained at ages 21-22, 23-24, and 25-26 yrs. In addition, participants' prosocial judgment was assessed with interviews and with an objective measure of prosocial moral reasoning at several ages. Reports of prosocial behavior and empathy-related responding in childhood and observations of prosocial behavior in preschool also were obtained. There was interindividual consistency in prosocial dispositions, and prosocial dispositions in adulthood related to empathy/sympathy and prosocial behavior at much younger ages. Interview and objective measures of moral reasoning were substantially interrelated in late adolescence/early adulthood and correlated with participants' and friends' reports of a prosocial disposition. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Neuropsychological functioning in older insomniacs with or without obstructive sleep apnea.

The relationships between neuropsychological functioning and sleep loss, sleep apnea, and hypoxemia were examined. Forty-five older insomniacs (M age?=?64.6 yrs) with or without sleep apnea were administered neuropsychological tests after 1 night of nocturnal monitoring in a sleep laboratory. The results showed few differences on cognitive and psychomotor performance between individuals with sleep disruptions alone compared with those whose insomnia was associated with sleep apnea and hypoxemia. There were no significant relationships between nocturnal sleep and respiratory variables and daytime functioning. Furthermore, cognitive and psychomotor performance in older insomniacs with or without sleep apnea revealed minimal impairment compared with age-matched normative data. The results suggest that when the severity of sleep disruptions is controlled, there are minimal differences in neuropsychological functioning of older adults with mild to moderate sleep apnea compared with those without apnea. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Learned resourcefulness as a moderator of burnout in a sample of rehabilitation providers.

Investigated learned resourcefulness, assessed by the Self-Control Schedule as a moderator of burnout, among 260 rehabilitation workers. It was hypothesized that learned resourcefulness would moderate a tendency for burnout to increase with years of experience. In regression analyses, the interaction of learned resourcefulness and years of experience significantly predicted scores on the Personal Accomplishment (PAC) scale but not the Emotional Exhaustion or Depersonalization scales of the Maslach Burnout Inventory. Years of experience were associated with slight decreases in PAC scores for low resourceful Ss and slight increases for high resourceful Ss. Findings support the theoretical utility of learned resourcefulness. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Reinforcement of verbal affect responses of normal subjects during the interview.

"Twenty-six normal individuals, hospitalized for a variety of physical complaints, were interviewed for a period of 30 minutes. Each interview consisted of a 10-minute operant level period, during which E asked questions necessary to maintain S's talk but did not otherwise respond to S's speech; 10 minutes of conditioning, during which E reinforced by agreement all self-referred affect statements; and 10 minutes of extinction, during which E withheld all reinforcement. Conditioning of the verbal response class of self-referred affect statements occurred, and normal Ss showed greater resistance to extinction than did schizophrenics." (PsycINFO Database Record (c) 2010 APA, all rights reserved)