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Brain-stem auditory evoked potentials in children and adolescents with anorexia nervosa.

Pilecki W, Bolanowski M, Szawrowicz-Pelka T, Kalka D, Janocha A, Salomon E, Rusiecki L, Czerchawski L, Sobieszczanska M.
Journal Article 2010; 31(2): 275-280 PubMed PMID: 20424593 Citation  Keywords:  Acoustic Stimulation:methods, Adolescent, Anorexia Nervosa:physiopathology, Auditory Pathways:physiopathology, Auditory Perception, Brain Stem:physiopathology, Child, Cochlear Nerve:physiopathology, Evoked Potentials, Auditory, Brain Stem, Female, Humans,.   

OBJECTIVE: In the course of anorexia nervosa (AN), the central nervous system (CNS) undergoes both anatomic and functional changes that may cause disturbances of stimulation transmission in the sensory areas of CNS. Method of brain-stem auditory evoked potentials (BAEPs) was used in the children with AN to test the auditory pathway transmission.

MATERIALS AND METHODS: The study included 37 children and adolescents, aged 10-18 years, with clinically diagnosed AN. BAEPs were recorded after a click stimulation of 75 dB intensity. Then, wave I latency (response from the auditory nerve) and inter-peak latency I-V (IPL I-V; response from the brain-stem) were analyzed.

RESULTS: Abnormalities of the BAEPs recordings were noted total in 32.4% of the study patients. Predominantly (in 24.3%), a decreased transmission within the brain-stem, expressed as the IPL I-V prolongation, was observed. It was also found that the percentage of the abnormal BAEPs results and the degree of IPL I-V prolongation were increasing together with enhancing AN severity.

CONCLUSIONS: IPL I-V prolongation observed in the AN children reflects a disturbed neural transmission in the brain-stem section of the auditory pathway and can be ascribed to impairments in the nerves myelin sheath....

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Effects of colour exposure on auditory and somatosensory perception--hints for cross-modal plasticity.

Landgrebe M, Nyuyki K, Frank E, Steffens T, Hauser S, Eichhammer P, Hajak G, Langguth B.
Journal Article 2008; 29(4): 518-521 PubMed PMID: 18766155 Citation  Keywords:  Adolescent, Adult, Auditory Perception:physiology, Color, Humans, Male, Photic Stimulation, Touch:physiology,.   

OBJECTIVES: It is well known that colour exposure can influence emotions, behaviour and perception. To get further insight into these complex synesthetic phenomena, the effect of colour stimulation on auditory and somatosensory perception was systematically investigated.

METHODS: 14 healthy male volunteers with normal colour vision rated the loudness of auditory stimuli with a standardized scale during exposure to white, red and green light. Furthermore temperature perception was assessed during exposure of the different colours using a thermal sensory analyser.

RESULTS: Colour exposure significantly altered auditory and somatosensory perception. Red light enhanced loudness perception and decreased cold pain thresholds, while green light stimulation reduced loudness perception and increased detection and pain thresholds for warm stimuli.

CONCLUSIONS: This data give further evidence for cross-modal plasticity in human perception. Colour stimulation influences auditory and somatosensory perception and may therefore have potential as a new treatment strategy of phantom perceptions such as tinnitus or chronic pain....

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