Biomedical subjects

G A Lindley

Publications and source records attributed to G A Lindley.

4 recordsLinked to original sources

PubMed2000

Adaptation to loudness and environmental stimuli in three newly fitted hearing aid users.

Hearing aid fitting strategies can be categorized according to whether a loudness normalization or a loudness equalization rationale is employed. Regardless of the underlying rationale, the amount of patient participation in determining the initial hearing aid settings will vary when an audiologist-driven (AD) versus a patient-driven protocol is employed. When an AD protocol is used, few changes are made during the initial fitting session based on user feedback. It is assumed that the patient will adapt to the loudness and/or sound quality provided by the hearing aids if not immediately acceptable. The following three case reports document varying degrees of adaptation to hearing aid settings derived using an AD approach. Clinical implications will be discussed.

Adaptation, Physiological↗

PubMed1998

The functionally and physiologically plastic adult auditory system.

The potential for functional and underlying physiological change in the adult auditory system is examined through review and evaluation of several sets of literature including auditory deprivation and recovery, auditory learning after hearing aid fitting, auditory abilities of normal listeners exposed to masking noise, and neural plasticity in the sensory and motor systems of animals. This tutorial review is meant for the reader who may be interested in auditory learning and who would like to have a summary and evaluation of the various findings to date. The focus of the review is the effect that various findings of auditory learning may have on hearing aid fitting and selection.

Adult↗

PubMed1998

Reliability of the Contour Test in a population of adults with hearing loss.

With the increasing popularity of hearing aids with wide dynamic range compression, where the goal may be to restore normal perception of loudness, there has been renewed interest in obtaining individual loudness judgments in a clinically feasible, reliable manner as part of the hearing aid evaluation. The purpose of the current investigation was to evaluate the test-retest reliability of the Contour Test of Loudness Perception. Twenty-seven adults with hearing loss participated in the experiment. They produced loudness judgments on two separate occasions. Results as assessed by the intraclass correlation statistic revealed that the Contour Test has adequate consistency and absolute agreement across frequency and loudness categories over two test sessions separated in time. Results are discussed in relation to previous reliability findings from other loudness judgment methods and other subject populations.

Adult↗

PubMed1997

Environmental awareness and level-dependent hearing protection devices.

OBJECTIVE: The effect of level-dependent hearing protection devices (HPDs) on subjects' ability to identify real-life environmental sounds was investigated. DESIGN: Eighteen subjects with no hunting experience attempted to identify sounds (crow, duck, turkey, deer, owl, goose, and person) recorded at various distances in the presence of the SoundScope and Sonic II level-dependent HPDs as well as in an open ear condition. Knowles Electronic's Manikin for Auditory Research was employed in making the experimental recordings. The Sonic II accomplishes level-dependent attenuation via a passive mechanism, whereas the SoundScope employs active circuitry that attenuates loud sounds while providing a small amount of high frequency amplification for soft sounds. Both devices are commercially available and are advertised for hunters/shooters. Sound identification scores (SISs) were determined for each condition. RESULTS: Mean SISs differed significantly among the three earplug conditions, collapsed over type of sound and distance, with the best SIS obtained under the open ear condition (96.43%) and the worst under the Sonic II condition (84.13%). Further analysis revealed that the listening conditions differed significantly only at the 100 yard distance. CONCLUSIONS: Auditory awareness was not maintained by either device investigated during the 100 yard condition. However, auditory awareness was maintained by both devices at a distance of 75 yards or closer. These devices may be appropriate for use in certain hunting/shooting situations depending on several factors including type of game being hunted, environment, and shooting range of the weapon. Further support also is provided for the usage of level-dependent HPDs during recreational shooting activities (i.e., at a shooting range).

Adolescent↗