4 Overstated
Profoundly deaf candidates for cochlear implants can experience musical hallucinations before surgery, which often resolve after cochlear implantation restores speech hearing.
"before they have that cochlear implant surgery, when they've been profoundly deaf, they can have memories of music that they used to listen to. So these are auditory hallucinations, but they are different. They're musical hallucinations... And what's fascinating is, after they get the cochlear implant and now they can hear speech, those musical hallucinations go away." (said at 0:30:19)
Profoundly deaf individuals can indeed experience musical hallucinations (often termed Musical Ear Syndrome or musical hallucinosis) due to auditory deafferentation. However, the claim that cochlear implantation reliably causes these hallucinations to go away is overstated. While restoration of auditory input can suppress or resolve musical hallucinations in some patients, observational studies demonstrate that musical hallucinations frequently persist after cochlear implantation (e.g., continuing in ~75% of pre-implantation cases in a cohort of 358 patients) and can also emerge de novo following surgery.
Between 80% and 90% of adults in the United States carry cytomegalovirus (CMV).
"Something like 80 to 90% of adults in the United States carry CMV." (said at 0:48:15)
Nationally representative data from the National Health and Nutrition Examination Survey (NHANES) demonstrate that cytomegalovirus (CMV) seroprevalence in the United States general/adult population is approximately 50% to 60% overall (age-adjusted seroprevalence ~50.4%), rather than 80% to 90%. While seroprevalence rises with age and can approach 80% to 90% in elderly populations (or in developing nations globally), the overall figure for US adults is significantly lower. The speaker likely confused CMV seroprevalence with global figures or with Epstein-Barr virus (EBV), which infects >90% of adults.
Premenopausal women tend to have better hearing sensitivity on average than men, but postmenopausally their hearing thresholds catch up to men.
"What we know is that women tend to have better hearing premenopausally, but post-menopausally they catch up to men. So there are data showing that estrogen contributes to better hearing" (said at 1:56:14)
While young and premenopausal women generally demonstrate better hearing sensitivity (lower thresholds and higher otoacoustic emission amplitudes) than men, epidemiological and review data indicate that elderly men continue to exhibit more severe and earlier high-frequency hearing loss than age-matched women rather than postmenopausal women simply 'catching up' to men. Furthermore, while experimental models demonstrate estrogen receptor expression in the inner ear and some protective signaling, human epidemiological data show heterogeneous postmenopausal trajectories and mixed outcomes regarding estrogen replacement therapy (with some large cohorts showing no benefit or increased hearing loss risk).
Auditory neurons have spontaneous firing rates reaching hundreds of spikes per second.
"And auditory neurons are the most active because they have spontaneous firing rates that are really high, hundreds of spikes per second." (said at 2:06:03)
Auditory nerve fibers (primary auditory neurons) exhibit unusually high spontaneous activity in the absence of sound, traditionally classified into low (<0.5 spikes/s), medium (0.5–18 spikes/s), and high (>18 spikes/s) spontaneous rate groups. While high-spontaneous-rate fibers frequently fire at rates up to ~100 spikes per second (and driven firing rates in response to acoustic stimulation can reach several hundred spikes per second), spontaneous discharge rates typically top out around 100–120 spikes/s rather than reaching multiple 'hundreds of spikes per second'.
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