PPT-Mechanisms of stimulus feature selectivity in sensory systems

Orientation and direction selectivity in the visual cortex Selectivity to sound frequency in the auditory cortex Feature selectivity in the somatosensory system Orientation selectivity in the primary visual cortex. In all sensory receptors the stimulus causes a change in membrane permeability causing a generator potential However many sensory r eceptors photoreceptors cochlear hair cells and vestibular hair cells do not produce action potentials as a result Students will be able to: . 1. define . stimulus and . response. 2. classify . stimulus/response . . interactions.   . 3. describe . stimulus/response interactions in an . ecosystem. . Sensory Physiology. About this Chapter. General properties of sensory systems. Somatic senses. Chemoreception: smell and taste. The ear: hearing. The ear: equilibrium. The eye and vision. Table 10-1 (1 of 2). Sensory systems receive information from the environment via specialized receptors in the periphery and transmit this information through a series of neurons and synaptic relays to the CNS. . Sensory . الاحساس اللمسي. of Touch, Pressure, and Vibration. . Although touch, pressure, and vibration are frequently classified as sepa­rate sensations, they are . all detected by the same types of receptors. 16-1: . WHAT ARE . SENSATION. AND . PERCEPTION. ? WHAT . DO WE MEAN . BY . BOTTOM-UP PROCESSING . AND . TOP-DOWN PROCESSING?. Sensation and perception are actually parts of one continuous process.. Sensation: . Note: To determine the type of mechanism you must be able to determine the stimulus and response.. Feedback Mechanisms. Identify a Stimulus and Response. Your dog chases the ball and you say “Good Boy!”. الاحساس اللمسي. of Touch, Pressure, and Vibration. . Although touch, pressure, and vibration are frequently classified as sepa­rate sensations, they are . all detected by the same types of receptors. forthcoming . in . Australasian Journal of Philosophy. central goals. My aims in this talk:. uncover the underlying nature of biological sensory powers. outline an approach to the accuracy conditions of sensory states. Assistant Professor. MBBS, . Mphil. Stimulus & Modalities. A . stimulus . is a change detectable by the . body.. Stimuli . exist in a variety of energy forms, or . modalities, . such as heat, light, sound, pressure, and chemical changes. Receiver = papilla of the tongue . . transformer = taste buds . . conductor = cranial nerve VII. . Analyzer = temporal lobe . Touch . Stimulus = . pain, pressure, temperature . Receiver = . skin . SECTION 1: SENSATION. WHAT IS SENSATION?. Def. : what occurs when a stimulus activates a receptor. Stimulus. : an aspect of or change in the environment to which an organism responds. SENSATION CONTINUED. Dr. Salah Elmalik. Objectives. By the end of this lecture students are expected to:. Identify the major sensory receptors & pathways. Describe the components, processes and functions of the sensory pathways. Per-Ola Norrby. BigChem. Training School. 9 May 2019. Chemical . reaction. . selectivity. , forward . prediction. Reduction. Chemoselectivity. Regioselectivity. Enantioselectivity. Chemical . reaction.