Department of Primatology and multidiciplinary Program, Bogor Agricultural University Indonesia
Received Date: May 17, 2017; Accepted Date: June 15, 2017; Published Date: June 30, 2017
Citation: Nugroho DAA (2017) Sexual Excitement as a Function of Stimulus Novelty Level and its Repetitions in a Male Pig-Tail Macaque (Macaca Nemestrina) Model (A Medical Hypothesis). J Psychiatry 20: 426. doi:10.4172/psychiatry.1000426
Copyright: © 2017 Nugroho DAA. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
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Aim: Sexual functioning is generally impaired during depression. This article would like to demonstrate a principle of behavior that can ultimately become a solution of sexual dysfunction by controlling the number of stimulus repetitions then this is an effective way to maintain the novelty of stimulation that can regain the excitement of behavior in terms of response time and duration. Method: An eight years old male pigtail macaque model named "John" who lives in an individual cage (5 × 5 × 5 m). The researcher did an audio-visual stimulation as much as 1 time a day at 07.00 am (morning) and did the repetitions for 4 days in a row. Based on video recordings, then response times or arousal times into scratching behavior toward his sexual organs such as penis and anus by his hands and their behavior-duration analysed by using real time player in seconds. Result and conclusion: So far, these result will have implication that if the number of repetitions of the stimulus decreased (thus kept the stimulus novelty level still) then the arousal times into the sexual response (scratching behavior) will be faster, and the duration of the sexual response (scratching behavior) will be longer as the number of repetitions of the stimulus decreases.
Sexual excitement; Stimulus novelty; Repetition; Scratching behavior; A male pig-tail macaque (Macaca nemestrina)
Sexual problems are associated with a reduction in the quality of life, and represent a major risk factor for the development of depression, and are often associated with other mental health problems . Sexual functioning is generally impaired during depression . Depression affected DISF (Derogatis Inventory of Sexual Function) domains differently: orgasm was most impaired, whereas sexual desire was preserved, more severe depression resulted in greater sexual dysfunction . The severity of sexual dysfunction among patients with MDD (Major Depressive Disorder) was most correlated with the severity of the depressive dimension, but not the severity of the somatic dimension .
In human, sexual dysfunction is both a symptom of depression and an adverse effect of many antidepressants [5,6]. Most antidepressant drugs have adverse effects on sexual function , but accurate identification of the incidence of treatment-emergent dysfunction has proved troublesome, as disturbances of the sexual response can only be detected in a reliable fashion when systematic enquiries are made before and during the course of treatment . Although Tianeptine is a new antidepressant drug with less adverse effects on sexual functions  but the multi factorial origin of both depression and sexual dysfunctions suggests that the right approach and treatment of the depressed patient includes not only the prescription of an antidepressant but also a global approach based on several axis that are concomitants namely: physiological, cognitive, emotional, behavioural and relational factors .
Cognitive distraction is a significant contributor to sexual response problems in men and women and is observed more consistently for genital arousal than for subjective arousal  although there was finding shown that being or not in a relationship seems to be a risk factor for sexual dysfunction . There is need for collaboration between healthcare practitioners from different disciplines in evaluation, treatment, and education issues surrounding sexual dysfunction .
For human, Freud portrayed little Hans (“A Phobia in a Five Year Old Boy”), who was fascinated by his penis (his “widdler”), and whose immediate impulse when meeting any person or object was to examine it to see if it too had a widdler. Sexual curiosity starts, according to this first formulation, by the child discovering and taking pleasure in the sensations of his sexual organ . That is why the decline in sexual excitement may become into a serious psychiatric problem that accompanies depression.
Here we try to propose the solution by decreasing the number repetitions of sexual-stimulation to keep its novelty based on findings that repetition-related reductions in neural activity  and the stimulus novelty was thought to increase and maintain the level of response of the excitement of a behavior due to it could triggers the amygdala activities , regardless that stimulus repetition in identification tasks leads to improved behavioral performance . It rises to the hypothesis that the level of stimulus novelty will decrease if the number of repetitions was increased. If the level of novelty decreases then the response level of the sexual enthusiasm will also decrease in terms of response time and duration.
To improve sexual excitement and prevent sexual dysfunction in human societies while avoiding ethical complexities, here we used a model by male pig-tail macaque (Macaca nemestrina) who showing sexual excitement or sexual arousal when responding to stimulus novelty but decline by its repetitions as a model in a repeated-analyses method.
The subject of the study was an eight years old male pigtail macaque named "John" who lives in an individual cage (5 × 5 × 5 m). The research place was an Animal Rescue Center in Tabanan, Bali Indonesia. The study time was 4 days. The operational definition of dependent variable here were the response times or arousal times into scratching behavior toward his sexual organs such as penis and anus by his hands and his behavior durations. The operational definition of independent variable (stimulation) here were the researcher existence (visually in front of the cage plus the short voice calling the subject-name) and its repetitions during 4 days.
The researcher walked closer to the subject enclosure while carrying the video camera on the ‘on’ position, then calling the subject-name with short voice: “Hello John!” (when arrived in front of the cage). The researcher recorded the subject response at a distance of 0.5 meters from the cage. The researcher did this stimulation as much as 1 time a day at 07.00 am (morning) and did the repetitions for 4 days in a row. Based on video recordings, then response times or arousal times into scratching behavior and their duration analysed by using real time player in seconds.
Scratching behavior by John started with standing behavior previously. Most of them accompanied by sounding behavior or vocalizations but here we decided not to analysed it due to unstable distances between researcher and the subject during the observation time.
The response time to the 1st stimulation was about 1 second (Video 1). The response time to the 2nd stimulation was about 2 seconds (Video 2). The response time to the 3rd stimulation was slower than the response time to the 1st and 2nd stimulation, it was about 4 seconds (Video 3). At the 4th stimulation, it became a stage of boredom so that the sexual response (scratching behavior) did not appear at all but turns into a ‘wondering’ response or stereotypic behavior (Video 4). If the number of repetitions of the stimulus increased (thus lowering the stimulus novelty level slowly) then the arousal times into the sexual response (scratching behavior) will be slower as the addition of the number of repetitions of the stimulus (Table 1 and Figures 1 and 2).
|Repetitions||Time schedules (please see the videos) in the seconds||Response times
|Stimulation ->(I said:
|Response-> Scratching behavior|
Table 1: The function of stimulus repetitions on response times into scratchingbehavior (sexual excitement).
The duration of response to 1st stimulation was longer than the duration of response to the 2nd stimulation, it was as long as 6 seconds (Video 1). The duration of response to the 2nd stimulation was shorter when compared to the duration of response to the 1st stimulation, it was as long as 5 seconds (Video 2). The duration of response to the 3rd stimulation was shorter when compared to the response time to the 1st and 2nd stimulation, it was as long as 4 seconds (Video 3). As mention above, the 4th stimulation became a stage of boredom so that the sexual response (scratching behavior) did not appear at all but turns into a ‘wondering’ response or stereotypic behavior (Video 4). If the number of repetitions of the stimulus were increased (thus decreasing the stimulus novelty level slowly) then the duration of the sexual response (scratching behavior) will be shorter as the number of repetitions of the stimulus increases (Table 2 and Figures 3 and 4).
|Repetition||Time schedules (please see the videos) in the seconds||Durations
|Response-> Scratching behavior|
Table 2: The function of stimulus repetitions on duration of scratching behavior (sexual excitement).
These result could support the idea that although repetition under incidental-learning conditions could declined the memory of repeated items  so could kept its effect on excitement but prior item repetition reduces attention to subsequent presentations of the item, decreasing the likelihood that critical item–source associations will be encoded .
So far, these result will have implication that if the number of repetitions of the stimulus decreased (thus kept the stimulus novelty level still) then the arousal times into the sexual response (scratching behavior) will be faster, and the duration of the sexual response (scratching behavior) will be longer as the number of repetitions of the stimulus decreases.
This study attempts to explore the link of sexuality and novelty. The study was done on primate inside a cage. The behavior of animals in captivity may does not correlate with human behavior directly but here we could demonstrate the principle of such behavior in controlling sexual disturbances which can leads to psychiatric problems such as “Depression”. As depression is the major and commonly occuring diseases in people and it is increasing day by day. The principle of this behavior can be one of the cause and so it can help to improve in some ways, thus we propose the result as a medical hypothesis due to the behavior of macaque which changed with the change in repetition of stimuli may also indicate other traits than sexual stimulation to novelty.
We thank drh. Bayu Wirayudha (head of FNPF), pak Putu, pak Ketut, and I Gusti “Samson” for their support and helps. This research was supported by Friends of National Park Foundation (FNPF).
The author declares does not has any conflicts of interest.