Auditory steady-state responses (ASSRs) were elicited by presenting single or multiple, 77-105 Hz amplitude-modulated 0.5, 1, 2, and 4 kHz tones to one or both ears. Objectives of this study were to (i) replicate and extend previous multiple ASSR studies in a quiet double-walled sound booth, and (ii) discover differences (if any) between thresholds assessed in monotic and dichotic conditions, w...

Dichotic word recognition was evaluated in free-recall, directed-attention right, and directed-attention left response conditions. All participants were right-handed and included a group of young adults with normal hearing and two groups of older adults with sensorineural hearing loss. Dichotic word recognition performance was best for young adults and decreased for each older group. A right-ea...

This project focused on the individual differences underlying observed variability in temporal processing among older listeners. Four measures of vowel temporal-order identification were completed by young (N=35; 18-31 years) and older (N=151; 60-88 years) listeners. Experiments used forced-choice, constant-stimuli methods to determine the smallest stimulus onset asynchrony (SOA) between brief ...

Dichotic Interaural Intensity Difference (DIID) training was designed to address deficits in dichotic processing. The present review describes the theoretical and physiologic bases for this procedure, highlighting the available efficacy data that are currently available. Additionally, a new approach to the DIID (i.e., DIID II) is presented in which interaural timing deficits are utilized during...

Studies using dichotic listening tasks have reported findings suggestive of alterations of cerebral laterality in schizophrenia and affective disorders. In a review of these findings, an effort was made to take into account four factors: (1) type of dichotic listening task; (2) performance level; (3) clinical state of patients at the time of testing; (4) diagnostic subtype of patients. A conver...

Binomial Test Example: Instances of sevens as digits from a random digit generator Step 1: Formulate hypotheses. H0 : π = 1 10 , Ha : π 6= 1 10 Step 2: Obtain a test statistic. In this case, I indicated a sample of 200 random digits yielded 35 sevens. Step 3: Calculate the P -value. The P -value is the conditional probability of obtaining a test statistic at least as extreme as ours given that ...

Subjects made lateralization judgments involving dichotic sequences of 250-ms tones, which alternated in frequency between 400 and 800 Hz, such that when one ear received 400 Hz the other ear received 800 Hz, and vice versa. With sequences consisting of 20 dichotic tone pairs there was a strong tendency to lateralize each fused tonal percept toward the ear receiving the 800-Hz signal. In certai...

BACKGROUND Far too little attention has been paid to the difference of Digit Span test and category verbal fluency test (CVFT) between normal and mild cognitive impairment (MCI) subjects. OBJECTIVE To investigate the difference of Digit Span test and CVFT between normal subjects and patients with MCI and study the influence of age, gender, and education on the task performance. MATERIAL AND...

It may be difficult to determine whether a dichotic lag-click points the left or right when preceded by diotic lead-click. Previous research suggests that this loss of spatial information is most prominent at inter-click intervals (ICIs)  20 ms), suggesting different mechanisms underlying lateralization short versus long ICIs.