Global ETD Search

1	Inferred Response Properties of the Synaptic Inputs Underlying Duration-Tuned Neurons in the Big Brown Bat / Response Properties of Inputs to Duration-Tuned Neurons Valdizon-Rodriguez, Roberto January 2019 (has links) Duration tuning in the mammalian inferior colliculus (IC) is created by the interaction of excitatory and inhibitory synaptic inputs. We used extracellular recording and paired-tone stimulation to measure the strength and time-course of the contralateral inhibition and offset-evoked excitation underlying duration-tuned neurons (DTNs) in the IC of the awake bat. The onset time of a short, best duration (BD), excitatory probe tone was varied relative to the onset of a longer-duration, non-excitatory (NE) suppressor tone. Spikes evoked by the roving BD tone were suppressed or facilitated when the stationary NE tone was varied in frequency or amplitude. When the NE tone frequency was presented away from the cell’s best excitatory frequency (BEF) or at lower SPLs, the onset of inhibition was relatively constant whereas the offset and duration of inhibition decreased. Excitatory and inhibitory frequency response areas were measured and best inhibitory frequencies matched best excitatory frequencies; however, inhibitory bandwidths were broader than excitatory bandwidths. Excitatory rate-level and inhibitory suppression-level functions were also measured and the dynamic ranges and inflection points were similar, which is hypothesized to play a role in the level tolerance of responses measured from DTNs. We compared the latency of offset-locked facilitation to the onset or offset of inhibition as a function of frequency and amplitude; we found that the facilitation was more related to the onset of inhibition. Moreover, facilitation typically preceded the offset of inhibition – suggesting that it is a separate excitatory input to DTNs and not a rebound from inhibition. We conclude that DTNs receive inputs that generate and preserve temporal selectivity. / Dissertation / Doctor of Philosophy (PhD) Auditory Physiology Temporal Processing Inferior Colliculus Electrophysiology Hearing Duration Tuning Neuroscience Big Brown Bat Level Tolerance Rate-Level Function Suppression-Level Function Facilitation
2	Music Preferences, Perceived Loudness, and Preferred Listening Levels : An investigation of sound level preferences for live sound reinforcement in Swedish free churches Ericson, Petrus January 2022 (has links) Sound levels in live sound reinforcement have long been a topic for debate in live concerts, but the subject is also important elsewhere. Swedish Christian free churches have also struggled for many years to optimize how sound reinforcement can serve the community. There are many different factors affecting the sound level preferences in live sound reinforcement environments. Among them are perception of loudness, musical preferences, hearing impairments and tolerances. This bachelor thesis investigated if musical preference affected the perceived loudness and/or the preferred listening level through a set of listening tests and qualitative surveys. It was investigated in one Swedish free church congregation, from which 16 subjects participated. The listening test was conducted with three parts: loudness matching stimuli to a pink noise, setting the preferred listening level of the stimuli and rating the preference of the stimuli. Subsequently, a survey after a service was conducted to investigate different factors affecting the experience. No connection between music preference and loudness perception or preferred level wasfound. However, the study did produce multiple findings that reveal factors affecting the sound level preferences in the chosen congregation, such as hearing impairments, expectations on the role of sound in worship services, and the balance of instruments. These findings revealed differences in opinion regarding the mix philosophy used in services, and the impact of these approaches on members of the congregation. Altogether, the findings point to recommendations and considerations for live sound engineers working in worship environments. Sound levels live sound reinforcement loudness music preference hearing impairments sound level tolerance church congregation mix philosophy sound balance role of sound worship worship music Ljudvolym ljudstyrka musikpreferens hörselskada balans kyrka lovsång kyrkomusik församling Pingstkyrkan Media Engineering Mediateknik Media and Communications Medie- och kommunikationsvetenskap

Search results

Inferred Response Properties of the Synaptic Inputs Underlying Duration-Tuned Neurons in the Big Brown Bat / Response Properties of Inputs to Duration-Tuned Neurons

Music Preferences, Perceived Loudness, and Preferred Listening Levels : An investigation of sound level preferences for live sound reinforcement in Swedish free churches