it has been found in accordance with this invention , that a hydrolyzed lysozyme composition characterized by a trp / lnaa ratio between 0 . 15 and 0 . 20 , and which provides a daily dose of up to 800 mg trp can rapidly act on the portions of the brain which is involved in reward by reducing brain functions during reward anticipation . thus , the hydrolyzed lysozyme composition can be used to help an individual overcome an undesired habit or addiction by lessening the reward which is derived from indulging in the behavior . thus , one aspect of this invention is a hydrolyzed lysozyme composition which is useful for assisting an animal , including a human in refraining from an undesired behavior , and / or resisting from indulging in an addictive behavior , or a reward - seeking behavior . in some embodiments the animal is a human . in preferred embodiments the hydrolyzed lysozyme composition does not contain any free trp ; and the trp is present in peptide - form only . another aspect of the invention is a method of assisting an animal , including a human , in refraining from an undesired behavior , and / or resisting from indulging in an addictive behavior or a reward - based behavior comprising a ) administering a hydrolyzed lysozyme composition which provides a daily dose of up to 800 mg trp , and b ) noticing or appreciating a lessening of the occurrence of the behavior , or abstinence from the behavior . another aspect of this invention is a method of doing business comprising marketing a hydrolyzed lysozyme composition for sale to a consumer wherein the hydrolyzed lysozyme composition provides a daily dose of up to 800 mg trp , comprising providing a kit , wherein the kit comprises a ) a hydrolyzed lysozyme composition ; and b ) information concerning the benefits that the composition has in assisting an animal , including a human , in refraining from an undesired behavior , and / or resisting from indulging in an undesired behavior . the use may also be in combination with an established therapy ( pharmocological and / or psychological ). the information may be provided by supplying information on the packaging , providing a package insert , by a displaying the information in proximity to the composition , or through other separate advertising media which is not in physical proximity to the product , i . e . by television , radio , internet , billboards , or other known advertising methods . alternatively , the information may be in the form of personal communication , such as that occurring in a counseling or group help session . fig1 is a diagram of the “ reward task ”. while blood oxygen level dependent ( bold ) functional magnetic resonance imaging ( fmri ) was acquired , reward and non - reward trials were randomly presented . subjects were cued with a red ( reward ) or green ( non - reward ) square of the type of trial . following a flexible delay a target appeared ( black circle ). subjects were asked to make a speeded button press at the moment of target appearance . if the response was on time , the subject earned a monetary reward for which they received feedback . however , rewards could only be obtained when a reward - cue had been presented , as was instructed to subjects prior to task . fig2 study flow . the study was conducted over 3 visits . during visit 1 subjects were screened . next , subjects were tested in a double - blind placebo controlled study on visit 2 and visit 3 . during visit 2 and visit 3 , mood questionnaires were administered and blood was sampled for trp / lnaa determination at three time - points . t1 : prior to consumption of either the test - product or control product ; t2 : 90 minutes after consumption just prior to fmri scanning , t3 : post - scanning 150 minutes after consumption . fig3 shows trp / lnaa plasma results . a : following test - product ( hydrolyzed lysozyme ) consumption , the trp / lnaa ratio is more than twofold increased . b : trp / lnaa ratio change from time - point 1 ( baseline ) at time point 2 ( 90 minutes after consumption of products ) ( δ2 ) and time point 3 ( post scanning ; 150 minutes after consumption of the products ) ( δ3 ). fig4 shows behavioral results of the reward processing task . number of hits ( a ), reaction times ( b ), probability of a response being correct ( c ), and reaction times for hits only ( d ) are depicted for reward and no reward conditions . comparing test - product ( left bars ) to control - product ( right bars ) revealed no effects of product consumption . brain responses can , thus , not be attributed to behavioural differences . fig5 shows that the reward anticipation was successful in probing the neural circuits involved in reward processing . these include the striatum , cingulate cortex , insula and motor cortex . fig6 shows that following control test - product consumption , neural responses to reward are highly induced in the dorsal caudate nucleus in comparison to after test - product consumption . this area has been implicated in higher cognitive processing integrating affective , motor and working memory components . ( arca indicated by an arrow ). fig7 shows the effect of product consumption on neural processing of reward fall ( indicated by a circle ) within areas indicated by the main effect of reward processing . the “ hydrolyzed lysozyme ” of this invention is preferably a hen egg lysozyme , and more preferably a hen lysozyme as described in wo2008 / 052995 ( us 2013 / 0231278 ). in preferred embodiments it is a mixture of at least two water - soluble tryptophan - containing peptides , having a trp / lnaa ratio of more than 0 . 15 , and preferably between 0 . 15 and 0 . 20 . it can be produced according to the process described in us 2013 / 0231278 a1 , which is hereby incorporated by reference , which includes the step of hydrolyzing lysozyme to a degree of hydrolysis of between 5 and 45 , preferably between 10 and 40 , and optionally removing part of the arginine or lysine containing peptides . in some embodiments , the molecular mass of the peptides produced is less than 500d . one such hydrolyzed lysozyme is commercially available from dsm nutritional products , basel , switzerland under the trademark lumivida ®. the hydrolyzed lysozyme may be mixed with food and / or pharmaceutical and / or nutraceutical carriers . the terms “ addictive ” or “ undesired ” or “ reward - seeking ” behaviors is intended to refer to behaviors which are considered ( either by the individual or by society ) to be dangerous , potentially harmful or otherwise undesirable , or which are intended to be refrained from , yet the individual finds them difficult to refrain from . examples of such behaviors in humans include : smoking , alcohol abuse , gambling , drug abuse ( such as cocaine , heroin , prescription painkillers and the like ) compulsive behaviors ( including behaviors typically associated with obsessive / compulsive disorder such as excessive hand - washing , repeatedly re - tracing one &# 39 ; s steps , or getting out of bed repeatedly to check on whether the door has been locked ) other uncontrollable behaviors such as compulsive shopping , eating , hoarding , sexual behaviors , kleptomania , pyromania , etc ) the potentially harmful risky behaviors of the thrill seeking “ adrenaline junkie ”. craving , obsessive eating disorder cutting or other self - harm syndrome improper sexual behavior / voyeurism each of these behaviors has a common element : each stimulates a reward / pleasure center in the brain , and the promise of the pleasure surrounding the activity can override the individual &# 39 ; s ability to refrain from the activity , even if the individual ultimately wishes to do so . “ refrain ” or “ prevention ” of the behavior is not intended to encompass only the situation where the behavior is never performed again ; rather it may also encompasses a lessening of the occurrence of the behavior , a lessening of the severity of the behavior , or a general improvement of the condition associated with the behavior . for example , the number of cigarettes smoked may be reduced , the amount of time spent on compulsive behaviors is lessened , or the amount of drug abuse is lessened . the hydrolyzed lysozyme composition may be used alone , or in combination with another therapy . for example , for someone wishing to give up cigarette smoking , the lysozyme composition may be used in combination with anti - smoking aids , such as nicotine patches or gums , anti - smoking counseling , or the like . for heroin addicts , the lysozyme hydrolysate may be used in combination with methadone , or other similarly - based treatments . for alcoholics , it may be used in combination with naloxone and / or group therapies or similar treatments . thus , another aspect of this invention is the use of a hydrolyzed lysozyme as an adjunctive treatment or supportive accompanying diet during dehabituation programs , or to assist dehabituation processes . the invention also has a veterinary application . animals , particularly those under stress , can develop so - called stereotypic behaviors . examples of these include the pacing observed in zoo animals ( such as polar bears ), repeated swallowing of air ( observed in horses ), uncontrolled eating ( observed in dogs ), or uncontrolled grooming / licking thus another aspect of this invention is the use of a lysozyme hydrolysate as part of an animal feed for the purpose of controlling unwanted stereotypic or pathological behaviors in an animal . a further aspect of this invention is a method of controlling unwanted stereotypic or pathological behaviors in an animal comprising administering an effective amount of lysozyme hydrolysate to the animal and observing improved behaviors . animals which can benefit include : farm animals , companion animals , racing animals , working animals and pets . the lysozyme hydorlysate may be in any form suitable for oral administration such as an additive to or supplement for feed or food , food or feed premix , tablets , pills granules , dragees , capsules , or effervescent formulations such as powers or tablets . it may also be in a liquid form such as a solution , emulsion or suspensions as in beverages , pastes or oily suspensions . controlled or delayed release formulations may also form part of this invention . furthermore a multi - vitamin / mineral supplement may be added to the nutraceutical composition . for human use , one recommended amount is 0 . 25 - 5 grams per day hydrolyzed lysozyme ( based on a 60 kg body weight ), but may be higher , such as up to 12 or 15 g / day . alternatively , the amount of hydrolyzed enzyme should provide the equivalent of approximately at least 500 mg tip , preferably 500 - 900 mg tip ; preferably 500 - 800 mg tip , and more preferably at least 800 mg trp . doses higher than 800 mg tip may also be used , but are not generally preferred . for animals , this amount can be adjusted according to the animal &# 39 ; s weight . in a human trial detailed in the examples , we found that the consumption of the hydrolyzed lysozyme composition resulted in large increases in trp / lnaa ratio which affected neural processing of reward . more specifically , hydrolyzed lysozyme composition consumption reduced responses in the dorsal caudate nucleus during reward anticipation . the reward anticipation task was successful in probing neural circuits previously implicated in reward anticipation in the context of instrumental responses . these regions included the striatum , cingulate cortex , supplementary motor areas , and middle frontal gyms . hydrolyzed lysozyme composition consumption led to a decrease in reward related responses in the dorsal caudate nucleus . whereas the ventral striatum has been implicated in motivation and the putamen in sensorimotor implementation ( stimulus - response coupling ), the caudate nucleus has been associated with higher order cognitive processes . more specifically , the dorsal caudate has been associated with active maintenance of goal representation in working memory , possibly via connections with the dorsolateral prefrontal cortex . the ventral aspects of the striatum receives projections from the medial prefrontal cortex ( pfc ) and orbitofrontal cortex , and the motor cortex projects to dorsolateral putamen with a decreasing projection gradient toward the dorsomedial striatum . this would allow the dorsal caudate to integrate initial emotional responses with cognitive information , and motor outputs . thus the hydrolyzed lysozyme composition reduced reward related activity in areas implicated in the integration of reward and punishment signals with higher order cognitive information and motor outputs . while not wishing to be bound by theory , these findings may be due to an increased tonic brain serotonin levels reflecting an overall negative situation . reward anticipation related signals are down scaled relative to this more negative overall situation , reflected in reduced reward anticipation responses in this task . the dorsal caudate nucleus appears optimally situated to process these integrated signals . in support of this suggestion , the dorsal striatum has been associated with the monitoring of value over long delays , a process improved by higher serotonin levels , and reflected in plasma trp levels . ( trp is the precursor of serotonin in the brain ). thus , reduced dorsal caudate signals by increased serotonin levels may echo better maintenance of goals over longer periods of time , and less impulsive switching . decreased dorsal caudate responses to reward anticipation following increased serotonin would suggest that the caudate integrates average situational negativity ( carried by a tonic serotonin signal ) with reward signals ( phasic dopamine signals ) according to which the latter are weight as less rewarding . this implies that the caudate integrates phasic reward and punishment signals with average reward and punishment signals . in resonance with this idea , the dorsal striatum has been reported to respond to both positive and negative outcomes and responds differentially to reward and punishment relative to the motivational state of a subject , suggesting that the caudate reflects weighted responses . considering the gradient in serotonin projections in the striatum and the overlap with da projections in the dorsal striatum , the dorsal caudate would be suited to integrate weighted reward and punishment signals . we suggest that increased trp results in increased serotonin levels signaling a negative situation . reward signals are scaled down relative to this more negative situation . this results in reduced reward related signals in the reward anticipation task leading to a decrease in dorsal caudate activity which integrates this signal with motor output . on a behavioral level this may lead to greater inhibition of impulsive reward seeking and negative thoughts , and reduced responsiveness to aversive events or agitation . in this light it is interesting to note that impulsive reward seeking ( craving ) has been associated with hyperactive ventral striatum responses in dependency disorders and that caudate hyperactivity is associated with obsessive compulsive disorders , which is reduced by selective serotonin reuptake inhibitors ( ssri ) treatment . finally , anhedonia , a key symptom of major depression disorder , has been suggested to reflect an inability to sustain positive affect over time , analogue to an inability to inhibit negative thoughts and that caudate volume is correlated with scores on the becks depression scale . thirty - two healthy young women ( age - range : 18 - 39 yr , mean : 22 . 387 , s . e . m . : 0 . 701 ) with normal - or corrected - to - normal vision , and normal uncorrected hearing , were included in the study . all subjects gave informed consent , were free of neurological or psychiatric history , right - handed , used oral hormonal contraceptives , and were tested in the second week of their menstrual cycle . subjects were free of magnetic resonance imaging ( mri )- contraindications , were not currently pregnant , breastfeeding , planning pregnancy , had not given birth within the last year , or experienced menopausal symptoms . subjects had no history of prescribed medication within the month prior to study , or over - the - counter medication or cannabis use in the two months prior to study , with the exception of oral contraceptives and paracetamol , and were not recipients of investigational products as part of research studies in the three months prior to initial dose in this study . subjects did not donate blood in the two months prior to initial study dose . subjects did not consume more than 10 cigarettes or 3 units of alcohol daily . subjects tested negative on drug and alcohol screenings . the study was approved by the institutional ethics committee ( cmo regio arnhem - nijmegen , the netherlands ). subjects consumed drinks ( 300 ml ) containing an equal amount of basis protein , but differential tryptophan ( trp ) and large neutral amino acids (“ lnaa ”), ( valine , isoleucine , leucine , tyrosine , and phenylalanine ) concentrations . the control product contained 20 g casein protein hydrolysate with 0 . 4 g trp and 10 g lnaa . the test product ( lumivida ®; dsm nutritional products , kaiseraugst , switzerland ) contained a hydrolyzed enzymatic digest of egg white with 0 . 8 g trp and 4 g lnaa ( 12 g lumivida ®). a sweetener ( 0 . 10 g acesulfame ) was added to make both formulations more palatable . the reward anticipation task ( fig1 ) is a modified version of the monetary incentive delay ( mid ) task in which cues are presented that either signal trials that are potentially rewarding or non - rewarding . this task consists of 25 potentially rewarding trials , 25 non - rewarding trials and 25 periods of low - level fixation with a mean duration equal to trials . in total , trials last between 8 . 5 and 11 . 5 s ( mean 10 s ). thus , the total duration of the task is 12 . 5 min . at the beginning of each trial , a cue ( cue duration : 3 . 5 - 8 . 5 s ; mean : 6 s ) is presented signaling a potentially rewarding ( red square ) or non - rewarding ( green square ) trial . following this cue , a target ( white circle ) is presented to which subjects have to respond as fast as possible ( by pressing a button ) irrespective of the cue type . when the button is pressed within the presentation time of the circle , the target remains on the screen , thus providing the participant with feedback that the target is hit . otherwise , it disappears . when the target is hit on a reward trial , subjects earn one euro . after disappearance of the target ( duration : 1 . 2 - 5 . 3 s ; mean 3 . 25 s ), short feedback is provided ( 500 ms ) of the current cumulative gain . to ascertain that reward outcome is similar across participants and sessions , the target duration is variable ( 150 - 500 ms ) and shortened with 20 ms for the subsequent trial when the previous target is hit . the target duration was lengthened with 10 ms for the subsequent trial when the previous target is missed . this procedure results in a hit rate of ± 33 % on average , ensuring that all participants win approximately the same amount of money ( between 8 and 11 euros ). mr data was acquired on a 1 . 5 t mr scanner ( avanto , siemens , medical , erlangen , germany ) equipped with 8 - channel transmit - receiver head coil . the manufacturer &# 39 ; s automatic 3d - shimming procedure was performed at the beginning of each experiment . subjects were placed in a light head restraint within the scanner to limit head movements during acquisition . resting state images were acquired using single - shot gradient echo - planar imaging ( epi ) with each of 266 images consisting of 39 axial slices ( 3 . 0 mm , 17 % gap , tr = 1 . 87 s , te = 35 ms , flip angle α = 80 °, field of view ( fov )= 224 × 224 mm 2 , matrix size = 64 × 64 . functional images were acquired with single - shot gradient echo - planar imaging ( epi ) sensitive to the blood - oxygenation level dependent ( bold ) response using the following parameters : 32 oblique transverse slices , slice thickness = 3 . 5 mm , matrix size 64 × 64 , fat suppression interslice gap = 10 %, repetition time ( tr )= 2 . 34 s , flip angle α = 90 °, echo time ( te )= 35 ms ( fov )= 212 × 212 mm 2 , matrix size 64 × 64 , fat suppression . a 3d magnetization - prepared rapid gradient echo ( mprage ) image was acquired for normalization procedures using the following parameters : tr = 2250 ms , te = 3 . 95 ms , 176 contiguous 1 mm slices , fov = 256 × 256 mm 2 , matrix = 256 × 256 . fmri data were processed and analyzed using the statistical software package spm5 ( wellcome trust centre for neuroimaging , london , uk ; http [ colon ][ slash ][ slash ] www [ dot ] fil [ dot ] ion [ dot ] ucl [ dot ] ac [ dot ] uk [ slash ] spm ). the first 5 epi volumes were discarded to allow for t1 equilibration . the remaining functional images from each subject were realigned using rigid - body transformation to correct for head movements to the mean functional image using 2 nd - degree b - spline interpolation and co registered to the anatomical t1 - weighted mr image using a normalized mutual information function . next , images were slice - time corrected to the mean slice . subsequently , images were spatially normalized into a common stereotactic space ( mni 152 t1 - template ) and resampled to 2 × 2 × 2 - mm 2 isotropic voxels using trilinear interpolation . finally , spatial smoothing was applied with an isotropic 30 gaussian kernel of 8 mm full - width half - maximum . the data were modeled voxel - wise , using a general linear model . trial - specific effects were modeled by trains of stick - or boxcar functions and convolved with the canonical hemodynamic response basis function of spm5 . additionally , realignment parameters were included to model potential movement artifacts . the data were high - pass filtered ( cut - off 128 s ) to remove low - frequency signal drifts , and a first - order autoregressive model was used to model the remaining serial correlations . contrast images of from testing parameter estimates encoding condition - specific effects were created for each subject . the single - subject contrast images were entered into voxel - wise one - sample t - tests to assess main effects of task , and paired - samples t - tests to assess task by drug interactions , implemented in a second - level random effects analysis . we report regions that survive cluster - level correction for multiple - comparisons ( family - wise error , fwe ) across the whole brain at p & lt ; 0 . 05 using an initial height threshold of p & lt ; 0 . 001 , unless otherwise indicated . significant task by drug interaction were followed up by seed - region analysis to assess covariance of brain region specific activity with a source region . for each subject , the time series from the source region were extracted ( the first eigen variate from the time series of all voxels ) and entered together with the realignment parameters as regressors into the first - level model . averaged time - courses for white - matter and cerebrospinal fluid were added to the first - level models to correct for these compartment signals . further analysis followed the same method as described above . finally , to assess whether the product - induced changes in trp / lnaa ratio predicted neural activity , voxel - wise regression analyses were performed between the product - induced changes in neural activity and the relative trp / lnaa ratio changes from time - point 1 ( baseline ) to time - point 2 ( 90 min after study compound intake ), as well as the relative trp / lnaa ratio changes from time - point 2 ( 90 min after study compound intake ) to time - point 3 ( after fmri tasks ). two separate regressors were created which modeled the onsets and duration of the reward predicting , and non - reward predicting cues . blood samples were collected in duplicates of 5 ml vacutainer tubes containing sodium heparin and centrifuged at 1550 g for 5 min at 4 ° c . the supernatant lithium heparin plasma ( 750 up was mixed with 120 μl sulfasalicyl acid in duplo and stored at − 80 ° c . until analysis . plasma amino acid analysis was conducted with high - pressure liquid chromatography ( hplc ), making use of a 2 - to 3 - μm bischof spherisorb ods ii column . the plasma tryptophan ratio was calculated by dividing the plasma tryptophan concentration ( in μmol / l ) by the sum of the other large amino acids , i . e . valine , isoleucine , leucine , tyrosine , and phenylalanine , and averaging over the two samples . subjects signed an informed consent form upon which they filled out a demographics and medical history questionnaire ( fig2 ). vital signs ( heart - rate , blood pressure , body height , body weight , and in - ear temperature were measured ). a urine sample was obtained , followed by dipstick urinalysis for ph , leucocytes , nitrite , protein , glucose , ketones , urobilinogen , bilirubin , and erythrocytes / hemoglobin , pregnancy and drug tests opiates , methamphetamines , amphetamines , benzodiazepines , canabinoids , cocaine ). an alcohol breath test was administered . a blood sample was obtained for chemistry ( 3 ml ; albumin , alkaline phosphatase , bilirubin , calcium , creatine , gamma - glutamyl transferase , inorganic phosphorus , lactate dehydrogenase , potassium , protein , s - aline aminotransferase , s - aspartate aminotransferase , sodium , triglycerides , urea ), haematology ( 3 ml ; erythrocyte sedimentation rate ; hematocrit , heamoglobin , thrombocytes , red blood cell count , white blood cell count ), deposition ( 2 . 4 ml ), and glucose ( 2 ml ) analysis . when the subject met all inclusion criteria and none of the exclusion criteria they were randomly assigned to an order of drug administration in a double blind cross - over paradigm . subjects had a light breakfast free of dairy products or caffeine . number of days since last menstruation was documented and vital signs were measured . then , at time - point 1 ( t1 ) a blood sample for trp / lnaa determination was obtained ( 2 × 6 ml ). subsequently , the test - or control - product was consumed . thawing of samples took place in a fridge over night before the start of the study . thawed samples were consumed within 4 hrs after thawing . samples were consumed cold . after 90 minutes , at time - point 2 ( t2 ), another blood sample for trp / lnaa determination obtained ( 2 × 6 ml ). next , subjects entered the mr scanner and the reward anticipation task was conducted . upon exiting the scanner , at time - point 3 ( t3 at about 150 minutes after product consumption ), a blood sample for trp / lnaa determination was obtained ( 2 × 6 ml ). visit 3 followed the same procedure with the exception that the other drug / placebo was consumed and no structural t1 - weighted scan was obtained . following completion of the study subjects were debriefed on the aims and details of the study . for each subject the two measures of trp / lnaa ratio for each time - point ( t1 : prior to supplementation ; t2 : pre - scan , approximately 90 minutes after supplementation ; t3 : post - scan , approximately 150 minutes after supplementation ) were averaged ( fig3 ). a product ( test - product , control - product ) repeated measures anova corrected for order of supplementation ( visit 1 , visit 2 ) on t1 baseline measures did not reveal any main effects ( fig3 a ). as such individual measures at t2 and t3 were divided by the measure at t1 , and expressed as a percentage difference from baseline ( fig3 b ). a product ( test - product , control - product )× time ( δt2 , δt3 ) 2 × 2 repeated measure anova revealed a main effect of product ( f 1 , 29 = 337 . 350 , p & lt ; 0 . 001 ), a main effect of time ( f 1 , 29 = 240 . 593 , p & lt ; 0 . 001 ), and an interaction effect of product × time ( f 1 , 29 = 257 . 017 , p & lt ; 0 . 001 ). paired t - tests reveal a trp / lnaa ratio increase following test - product consumption relative control - product consumption at both δt2 ( t ( 29 )= 26 . 031 , p & lt ; 0 . 001 ( two - tailed ); test - product mean : 119 . 723 , s . e . m . : 4 . 667 , control - product mean : − 21 . 148 , s . e . m . : 1 . 586 ) and δt3 ( t ( 29 )= 9 . 429 , p & lt ; 0 . 001 ( two - tailed ); test - product mean : 43 . 837 , s . e . m . : 6 . 07 , control - product mean : − 23 . 124 , s . e . m . : 1 . 998 ), and a significant difference between t2 and t3 following test - product consumption ( t ( 29 )= 16 . 484 , p & lt ; 0 . 001 ( two - tailed )). consumption of the test - product caused more than 2 - fold increases in trp / lnaa plasma levels . although individual variance exists in the amount of change induced by the test - product , the increase is highly consistent across subjects . the number of hits for each condition ( reward , no reward ) was calculated per session for each subject ( fig4 a ). a product ( test - product , control - product )× reward ( reward , no reward )× 2 × 2 repeated measure anova revealed a main effect of reward ( f 1 , 27 = 19 . 822 , p & lt ; 0 . 001 ), with no other main effects or interactions . the probability of a response being a hit was calculated per session for each subject ( fig4 c ). a product ( test - product , control - product )× reward ( reward , no reward )× 2 × 2 repeated measure anova revealed a main effect of reward ( f 1 , 27 = 19 . 822 , p & lt ; 0 . 001 ), with no other main effects or interactions . reaction times for each condition ( reward , no reward ) were averaged over each session for every subject for hits only ( fig4 d ). a product ( test - product , control - product )× reward ( reward , no reward )× 2 × 2 repeated measure anova revealed a main effect of reward ( f1 , 25 = 44 . 726 , p & lt ; 0 . 001 ), with no other main effects or interactions . comparing the reward condition to the no - reward condition revealed greater bold signal in regions commonly detected in reward anticipation studies ( fig5 ). these included striatal regions , middle cingulate cortex , supplementary motor areas and the middle frontal gyms ( table 2 ). testing for the influence of product consumption on neural processing in the reward task we find greater bold signal during reward anticipation compared to no - reward anticipating following control - product consumption ( fig6 ). this effect centers on the dorsal caudate nucleus ( table 3 ).
this invention is directed to the use of a protein hydrolysate , and in particular an egg lysozyme hydrolysate to assist an animal , including a human in overcoming an addition , or by breaking an unwanted habit .