---
title: Impacts of Training on Effortful Listening
nct_id: NCT04921267
overall_status: COMPLETED
phase: EARLY_PHASE1
sponsor: Kansas State University
study_type: INTERVENTIONAL
primary_condition: Training Group
countries: United States
canonical_url: "https://parkinsonspathways.com/agent/trials/NCT04921267.md"
clinicaltrials_gov: "https://clinicaltrials.gov/study/NCT04921267"
ct_last_update_post_date: 2021-06-10
last_seen_at: "2026-05-12T06:32:06.474Z"
source: ClinicalTrials.gov (mirrored, no enrichment)
---
# Impacts of Training on Effortful Listening

**NCT ID:** [NCT04921267](https://clinicaltrials.gov/study/NCT04921267)

## Key Facts

- **Status:** COMPLETED
- **Phase:** EARLY_PHASE1
- **Study Type:** INTERVENTIONAL
- **Target Enrollment:** 87
- **Lead Sponsor:** Kansas State University
- **Conditions:** Training Group
- **Start Date:** 2019-10-10
- **Completion Date:** 2020-05-31
- **CT.gov Last Update:** 2021-06-10

## Brief Summary

Human listeners will hear speech masked by single-talker speech before and after auditory training.

## Detailed Description

Human listeners will hear speech masked by single-talker speech before and after auditory training. Training-related changes in EEG dynamics and behavioral measures of accuracy and effort will be assessed.

## Eligibility

- **Minimum age:** 18 Years
- **Sex:** ALL
- **Healthy Volunteers:** Yes

```
Inclusion Criteria:

* normal hearing

Exclusion Criteria:

* hearing loss
```

## Arms

- **trained group** (EXPERIMENTAL) — group receives training with sounds that correspond to simulated hearing protection
- **Control** (NO_INTERVENTION) — group receives no training

## Interventions

- **training** (BEHAVIORAL) — training with filtered speech

## Primary Outcomes

- **pretest EEG alpha power** _(time frame: one day before training)_ — power in the alpha-band
- **posttest EEG alpha power** _(time frame: one day after training)_ — power in the alpha-band
- **pretest accuracy** _(time frame: one day before training)_ — proportion correct for identifying speech
- **posttest accuracy** _(time frame: one day after training)_ — proportion correct for identifying speech

## Locations (1)

- Kansas State University, Manhattan, Kansas, United States

## Recent Field Changes (last 30 days)

- `status.overallStatus` — added _(2026-05-12)_
- `status.primaryCompletionDate` — added _(2026-05-12)_
- `status.completionDate` — added _(2026-05-12)_
- `status.lastUpdatePostDate` — added _(2026-05-12)_
- `design.phases` — added _(2026-05-12)_
- `design.enrollmentCount` — added _(2026-05-12)_
- `eligibility.criteria` — added _(2026-05-12)_
- `eligibility.minAge` — added _(2026-05-12)_
- `eligibility.sex` — added _(2026-05-12)_
- `outcomes.primary` — added _(2026-05-12)_
- `armsInterventions.arms` — added _(2026-05-12)_
- `armsInterventions.interventions` — added _(2026-05-12)_
- `sponsor.lead` — added _(2026-05-12)_
- `results.hasResults` — added _(2026-05-12)_
- `locations.kansas state university|manhattan|kansas|united states` — added _(2026-05-12)_

---

*Canonical: https://parkinsonspathways.com/agent/trials/NCT04921267.md*  
*Source data (authoritative): https://clinicaltrials.gov/study/NCT04921267*  
*This page is a raw mirror with no AI summary, no editorial enrichment, and no Parkinson's-specific filtering.*