Two-Point Discrimination Test: Determining the Two-Point Threshold

              When doing this experiment, I used my senses of touch and hearing to predict what the

* Sensations: The cutaneous sensations like touch, pressure, vibration, pain, cold, hot, etc, are felt by the skin.

A mechanoreceptor in the papillary layer of the dermis that responds to fine touch is a

The human sense of touch is known as the somatic or somatosensory system. The skin is the biggest and most complex organ in the somatosensory system.The somatosensory system permits the human body to experience pressure, texture, temperature, and pain, and to see the position and development of the body's muscles and joints.The receptor cells in the skin can be separated into three useful classifications: mechanoreceptors that sense pressure and surface, thermoreceptors that sense temperature, and nociceptors that sense pain. Thermoreceptors distinguish changes in temperature utilizing two sorts of receptor cells: warm and cold. Thus, thermoreceptors on the skin detects the temperature signal using two specific receptors cell: warm and cold.

The two-pronged test was developed to “determine whether that information demonstrated probable cause” (Ingram p.172) where the first part of the test, “an informant’s veracity and reliability had to be determined prior to finding that the informant’s information supplied probable cause” (Ingram p.173) In this part of the test the police had to prove that the informant was a believable person” (Ingram p.173), such as having a history of “giving a reliable and truthful information to the police in the past, and might even implicated himself or herself in a crime just to prove to the police that he or she is telling the truth. The reliability of certain personalities as an informant such as the “local priest, mayor and another police officer

The somatosensory system has to do with touch, pressure, pain, temperature, movement, and vibrations from muscles, joints, and skin. Uit sends sensations through the spinal cord, to the brainstem, then the thalamic relay nuclei to the parietal lobe that houses the sensory cortex.

This lab was not repeated to examine for consistent results, which may result in data where precision and accuracy are compromised. In this investigation,

Personally, it’s very hard to focus on counting when it feels like my hand is being choked by a bodybuilder on steroids. I was very distracted by the pain in my wrist, that I could’ve focus on counting. During the later trials (7-10), some of my counts may have been estimates instead of actual qualitative data. So some of the data is probably inaccurate and might’ve affected the overall average of each test. This is really the only major error that occurred. In the future, I will strive in achieving accurate results instead of using estimates that may or may not be

This study examined visual perception and the rates at which global and local features are reacted to with an aim of replicating and validating a previous experiment conducted by Navon (1977) to see if global processing was faster than local processing. There was 222 University of Newcastle students participating in the experiment, partaking in two phases, one centred round global processing, the other around local processing, where there reaction times were recorded using a computer program and imputed into a data worksheet. Results indicated that, as predicted, global processing occurred at a faster rate than local processing. It was concluded that global features were

Tactile receptors- free nerve endings in the skin are picking up the itching and burning

Dunn’s model proposes that individuals’ neurological thresholds for sensory stimuli and preferred self-regulation strategies influence their motor, behavioral, and emotional responses. A neurological threshold is a point at which a neuron or a sensory system is activated. Neurological thresholds are on a continuum and differ for each sensory system. Self-regulation strategies are also on a continuum and range from passive to active self-regulation strategies. The interaction of the neurological thresholds and self-regulation strategies leads to four sensory processing patterns. Individuals with the sensation-seeking pattern have high thresholds and use active self-regulation strategies and individuals with the sensation avoiding patterns have low thresholds and use active self-regulation strategies. Similarly, individuals with sensory sensitivity patterns have low thresholds and use passive self-regulation strategies and individuals with low registration patterns have high thresholds and use passive self-regulation strategies.

(Attention) Did you know that there are over 5,000,000 touch receptors in our skin and 3,000 of them are in the finger tips. Imagine all the endorphins being released by the slightest touch of another person.

Somatosensation is the collective sense of touch which enables us to feel our environment through the specialized receptors in our skin. While in primates, the glabrous hairless skin of the hand palm and fingers serves as sensory organ to palpate objects and obtain tactile information, rodents use their whiskers, organized in a series of rows and columns on the whisker pad located on each side of the snout (Fig.X). Rodent whiskers acquire somatosensory information by their deflection onto objects in the environment, like the digits of the human, they obtain information regarding their shape, texture and location. Somatosensation is an active process involving sensory/motor systems, where in humans a hand will press an object of interest in order to feel its textile features, the rodent macrovibrassae (whisker) will position itself in space, scanning the environment in a series of timed protractions and retractions cycles (5-10Hz). The interruption of the whisking cycle caused by the contact of a whisker onto an object provide the necessary spatio-temporal information for the construction of a sensory percept. A whisker touch contains numerous information carried out by the amplitude of the whisker deflection, the direction, duration, accelation/decelaration on contact, frequency of the contact, force along the axial shaft and resonance frequency of the whisker.

What is the effect of using your dominate hand vs your non-dominant hand when testing sensitivity? The purpose of answering this question is to help scientists understand if your hand dominance affects your sensitivity. One reason I chose this topic is because I have previously seen a similar experiment in a museum, and I would like to test one of my own. Another reason I chose this topic is because I am very interested in the outcome. I hope to discover if hand dominance influences sensitivity. This project will test your dominant hand vs your non – dominant hand when testing sensitivity.

You will use a two-point discrimination test to compare tactile resolution (and receptor density) on various parts of your body. An estheiometer is