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Samenvatting course Hersenen en gedrag van de bachelor medische biologie aan de Radboud universiteit
Samenvatting hersenen en gedrag 2013-2014
Lecture 1 Somatosensroisch systeem Receptor Function: Transformation of specific energy forms into neural signals, that the brain can interpret
Depolarization Action potential
Sensory modalities: Mechanoreceptors
pressure, force, length
The percept, summoned by the activity of a nerve, is being determined by the cortical area that the nerve is connected to. Labeled line code Coding the stimulus strength
Graded potentials in receptors. A stronger stimulus causes a higher firing frequency. Action potentials do not get bigger. There is a maximum number of spikes/sec (100-500 spikes/sec).
DIFFERENCE IN THRESHOLDS: RECRUITING
The sounds reaching our brains appear to be much louder than normal. This is because the recruited hair cells still function in their original critical bands and also in the adjacent one(s) they have been recruited into.
PERCEPTION: TWO KINDS OF THRESHOLDS
The amount of a stimulus which is required to simply detect it. The threshold is not determined in a sharp way. One of the reasons for this is noise in the central nervous system
Difference threshold (JND)
The size of the difference between two stimuli so that they are perceived as different
LAW OF WEBER Weber fraction (k) is a measure of the sensitivity of a system JND is not an absolute amount of stimulus, but is a constant proportion of the "standard" stimulus, IO Thus, the more intense (or larger) the background stimulus, the larger the increment needed to be in order for it to be detected on top of the background
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